# Samir Saker

### Bio

Professor Saker received his Ph. D. from Adam Mickiewicz University, Poznan, Poland in 2002. After that, he received four postdoctoral fellowships from Greece, USA, Canada and Turkey, where he is one of the recipients of a Fulbright scholarship. He was a Professor of Mathematics, Department of Mathematics, Faculty of Science, Mansoura University before joining GU. Professor Saker published and participated in the publication of more than 280 research papers published in International scientific journals in the field of mathematics and its applications in various sciences. He also co-authored three books published in the world's largest publishers (Springer) and two other books on differential, difference and dynamic equations published in Germany.

In recognition of his outstanding and distinguished scientific productions, Professor Saker has received many prestigious scientific awards such as:

- Khalifa Award as a distinguished professor of Scientific research on Arabic Countries (2020, United Arab Emirates),
- Mansoura University Awards of Excellence (2020, Egypt),
- The privilege of the first class from the president of Egypt (2016, Egypt),
- Abdul Hameed Shoman Award for Young Arab Scientists (2004, Jordan),
- Mathematics, National State Prize twice (2005, 2014) Egypt),
- State Incentive Award in Mathematics (Mansoura University many times),
- Mohamed Amin Lotfy Award on Basic Science (2010, Egypt).

### Qualifications

- B. Sc. In Mathematics, Rank First, Very Good with an honors degree, Mansoura University, Egypt. (May-1993)
- M. Sc. In Mathematics (Differential Equations), Mansoura University, Egypt. (Nov-1997)

Title: Oscillation of Solutions of Delay Differential Equations - Ph. D. in Mathematics, Adam Mickiewicz University, Poznan, Poland. (Dec-2002)

Title: Oscillation Theory of Delay Differential and Difference Equations and Some of Their Applications.

### Publications

**Area of Research**

• Ordinary and functional differential equations (delay and neutral delay equations).

• Difference equations.

• Population Models (Continuous and discrete).

• Mathematical models in Biology, Ecology, Economy, Epidemiology, and Medicine, etc.

• Dynamic equations on time scales.

• Dynamic inequalities on time scales (Opial, Wirtinger, Lyapunov, etc.).

• Hardy type inequalities.

• Applications of inequalities in studying distribution of zeroes of differential and dynamic equations.

• Hahn Operator and its Calculus, Boundary value problems, Q-Calculus.

• Zeros of Riemann Zeta Function.

• Fractional Calculus

• Higher integrability from reverse inequalities

• Higher summability from discrete reverse inequalities

• Applications of Higher integrability and summability.

Link to Publications:

__List of Publications: __

**LIST OF BOOKS**

1- Ravi P. Agarwal, D. O’Regan and Samir H. Saker, Analysis of Nonlinear Discrete Population Models, (under preparation).

2- S. H. Saker, Oscillation Theory of Delay Differential and Difference Equations: Second and Third Orders, Verlag der Muler, Berlin, Germany (2010).

3-S. H. Saker, Oscillation Theory of Dynamic Equations on Time Scales: Second and Third Orders, Lambert Academic Publishing, Berlin, Germany (2010).

4-Ravi P. Agarwal, D. O’Regan and Samir H. Saker, Oscillation and Stability of Delay Models in Biology, Springer (2014).

5-Ravi Agarwal, D. O’Regan and Samir H. Saker, Dynamic Inequalities on Time Scales, Springer (2014).

6-Ravi Agarwal, D. O’Regan and Samir H. Saker, Hardy Type Inequalities on Time Scales, Springer (2016).

__GUEST EDITOR__

- The special issue of “Qualitative Theory of Functional Differential and Integral Equations 2016", Abstract Appl. Analysis (2015).

https://www.hindawi.com/journals/aaa/si/592486/ - The special issue of “Qualitative Theory of Functional Differential and Integral Equations 2016", Abstract Appl. Analysis (2016) (under publications).

https://www.hindawi.com/journals/aaa/si/592486/ - Applications of Delay Differential Equations in Biological Systems, Complexity

https://www.hindawi.com/journals/complexity/si/384786/cfp/

__BOOKS FOR STUDENTS:__

Compile two books from Mc Graw Hill to King Saud University.

**Book 1:** Calculus, early transcendental functions (Third Edition)

Authors: Robert T. Smith, and Roland R. Minton

Year: 2008.

**Book 2:** Precalculus, Year: 2008

Authors: Raymond A. Barnett, Michael R. Ziegler and Karl E. Byleen.

__List of all Articles __

- Weighted Gehring and Muckenhoupt classes and some inclusion properties with norm inequalities, SH Saker, MH Hassan, JMCS 24 (3), 201-215, 2022.
- Some basic properties and fundamental relations for discrete Muckenhoupt and Gehring classes, SH Saker, SS Rabie, J Alzabut, D O’Regan, RP Agarwal, Advances in Difference Equations 2021 (1), 1-22, 2021.
- On Cesàro and Copson sequence spaces with weights, SH Saker, MM Abuelwafa, AM Zidan, D Baleanu, Journal of Inequalities and Applications 2021 (1), 1-23,
- Some new dynamic inequalities with several functions of Hardy type on time scales, A Hamiaz, W Abuelela, SH Saker, D Baleanu, Journal of Inequalities and Applications 2021 (1), 1-15, 2021
- Some new generalized weighted dynamic Inequalities of Hardy’s type on time scales, SH Saker, MMA El-Sheikh, AM Madian, JMCS 23 (4), 289—301, 2021.
- Weighted CebyCev-Ostrowski type integral inequalities with power means, AG Al-Taher, SH Saker, AM Ahmed, JMCS 22 (4), 189-203, 2021.
- Some fractional dynamic inequalities on time scales of Hardy’s type, AG Sayed, SH Saker, AM Ahmed, JMCS 23 (98—109), 2021.
- Fractional Opial dynamic inequalities, AG Sayed, SH Saker, AM Ahmed, JMCS 22 (4), 363—380, 2021.
- The weighted discrete Gehring classes, Muckenhoupt classes and their basic properties, SH Saker, M Krnic, Proceedings of the American Mathematical Society 149, 231-243 1, 2021.
- On structure of discrete Muckenhoupt and discrete Gehring classes, SH Saker, SS Rabie, G AlNemer, M Zakarya, Journal of Inequalities and Applications 2020 (1), 1-18, 2020. (1 citation).
- Half-linear dynamic equations and investigating weighted Hardy and Copson inequalities, SH Saker, AG Sayed, G AlNemer, M Zakarya, Advances in Difference Equations 2020 (1), 1-19, 2020.
- Characterizations of reverse dynamic weighted Hardy-type inequalities with kernels on time scales, SH Saker, MM Osman, D O’Regan, RP Agarwal, Aequationes mathematicae, 1-22, 2020
- Factorization Theorems of Cesaro and Copson Spaces on Time Scales, SH Saker, RR Mahmoud, Journal of Contemporary Mathematical Analysis (Armenian Academy of Sciences, 2020.
- Some New Weighted Dynamic Inequalities for Monotone Functions Involving Kernels, SH Saker, AI Saied, M Krnić, Mediterranean Journal of Mathematics 17 (2), 1-18, 2020.
- Some fractional dynamic inequalities of Hardy’s type via conformable calculus, S Saker, M Kenawy, G AlNemer, M Zakarya, Mathematics 8 (3), 434, 2020 (5 citations).
- Hardy-type operators with general kernels and characterizations of dynamic weighted inequalities, SH Saker, MM Osman, D O’Regan, RP Agarwal, Annales Polonici Mathematici 10 (10), 10.4064/ap191222-23-6, 2020.
- Forced oscillation of conformable fractional partial delay differential equations with impulses, SH Saker, K Logaarasi, V Sadhasivam, Annales Universitatis Mariae Curie-Sklodowska, sectio A – Mathematica 130 (2), 2020.
- Boundedness of discrete Hardy-Littlewood maximal operator via Muckenhoupt weights, SH Saker, RR Mahmoud, Rocky Mountain J. Math. 2020.
- Opial and Saitoh Type Inequalities on Time Scales, D O’Regan, SH Saker, SS Rabie, RP Agarwal, Journal of Convex Analysis 27 (3), 1073-1090, 2020.
- Some new dynamic Hardy-type inequalities with kernels involving monotone functions, SH Saker, AI Saied, M Krnic, Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie …2020.
- New Oscillation Criteria of First Order Neutral Delay Difference Equations of Emden-Fowler Type, SH Saker, MA Arahet, Journal of Computational Analysis & Applications 29 (2), 252, 2020.
- Riccati Technique and Oscillation of Second Order Nonlinear Neutral Delay Dynamic Equations, SH Saker, A. K. Sethi, Journal of Computational Analysis & Applications 29 (2), 266, 2020.
- New characterizations of weights in Hardy’s type inequalities via Opial’s inequalities, SH Saker, MM Osman, I Abohela, Journal of Computational Analysis & Applications 28 (1) 2, 2020.
- New dynamic inequalities on time scales by using the Sneak-out principle, SH Saker, MM Osman, I Abohela, Journal of Computational Analysis & Applications 28 (1) 1 2020.
- Gehring inequalities on time scales, M Bohner, SH Saker, J. COMPUTATIONAL ANALYSIS AND APPLICATIONS 28 (1), 11-23, 2020 (1 citation).
- Refinement multidimensional dynamic inequalities with general kernels and measures, SH Saker, HM Rezk, I Abohela, D Baleanu, Journal of Inequalities and Applications 2019 (1), 1-16, 2019 (9 citations)
- A higher integrability theorem from a reverse weighted inequality, S Saker, D O’Regan, R Agarwal, Bulletin of the London Mathematical Society 51 (6), 2019 (4 citations).
- A connection between weighted Hardy’s inequality and half-linear dynamic equations, SH Saker, RR Mahmoud, Advances in Difference Equations 2019 (1), 129, 2019 (3 citations).
- Norm Dynamic Inequalities and Theorems of Factorization of Weighted Cesàro and Copson Spaces, SH Saker, MM Abuelwafa, D O’Regan, RP Agarwal, Bulletin of the Brazilian Mathematical Society, New Series, 1-22, 2019.
- Higher summability theorems from the weighted reverse discrete inequalities, SH Saker, M Krnić, J Pečarić, Applicable Analysis and Discrete Mathematics 13 (2), 423-439, 2019 (3 citations).
- More accurate dynamic Hardy-type inequalities obtained via superquadraticity, SH Saker, HM Rezk, M Krnić, Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie 113, 3, 2691-2713, 2019 (9 citations).
- Some new dynamic inequalities involving monotonic functions on time scales, SH Saker, E Awwad, A Saied, Journal of Function Spaces 2019, 2019 (1 citation).
- Reverse dynamic inequalities and higher integrability theorems, SH Saker, I Kubiaczyk, Journal of Mathematical Analysis and Applications 471 (1-2), 671-686, 2019 (2 citations).
- Gaps between zeros of solutions for a certain class of third-order differential equations, MA Arahet, SH Saker, C Tunç, Arab Journal of Basic and Applied Sciences 26 (1), 453-461, 2019.
- Copson and converses Copson type inequalities via conformable calculus, SH Saker, MG Kenawy, Progress in Fractional Differentiation and Applications 5 (3), 243-254, 2019.
- Hardy’s Type Inequalities via Conformable Calculus, SH Saker, MR Kenawy, D Baleanu, Frontiers in Functional Equations and Analytic Inequalities 2019, 1-20, 2019 (2 citations).
- Oscillation Criteria for Second Order Differential Equations with a Sub-Linear Neutral Term, SH Saker, B Sudha, K Thangavelu, E Thandapani, Dynamics of Continuous, Discrete and Impulsive Systems Series A. 26 (5), 317-327, 2019.
- New Characterizations of Weights in Hardy and Opial Type Inequalities via Solvability of Dynamic Equations, SH Saker, AG Sayed, A Sikorska-Nowak, I Abohela, Discrete Dynamics in Nature and Society 2019 (2019), 13, 2019 (1 citation).
- Higher integrability theorems on time scales from reverse Hölder’s inequalities, SH Saker, MM Osman, M Krnić, Applicable Analysis and Discrete Mathematics 13 (3), 819-838, 2019 (1 citaion).
- Higher Summability and Discrete Weighted Muckenhoupt and Gehring Type Inequalities, SH Saker, I Kubiaczyk, Proceedings of the Edinburgh Mathematical Society, 1-25, 2019 (5 citations).
- Distribution of zeros of second order superlinear and sublinear neutral delay differential equations, SH Saker, B Sudha, MA Arahet, E Thandapani, Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie … 1-9, 2019 (1 citation).
- Levinson type inequalitis and their extensions via convexity on time scales, SH Saker, MM Osman, D O’Regan, RP Agarwal, Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie 113, 1, 299–314, 2019 (8 citations).
- Some dynamic inequalities involving Hilbert and Hardy–Hilbert operators with kernels, D O’Regan, HM Rezk, SH Saker, Results in Mathematics 73 (4), 1-22, 2018 (6 citations).
- Inequalities of Hardy type and generalizations on time scales, SH Saker, MM Osman, D O’Regan, RP Agarwal, Analysis (0174-4747) 38 (1), 2018 ( 5 citations).
- Oscillation criteria for first order delay dynamic equations, SH Saker, AM El-Shenhab, Bull. Math. Soc. Sci. Math. Roumanie 61 (109), 475-489, 2018.
- Lyapunov inequalities for dynamic equations via new Opial type inequalities, SH Saker, MM Osman, DO Regan, R Agarwal, Hacettepe University Bulletin of Natural Sciences and Engineering Series B …2018.
- New Carlson-Bellman and Hardy-Littlewood dynamic inequalities, SH saker, C Tunc, R Mahmoud, Math. Ineq. Appl. 21 (4), 967–983 , 2018 (3 citations).
- A unified approach to Copson and Beesack type inequalities on time scales, SH Saker, R Mahmoud, A Peterson, Math Inequalities Appl. 21 (4), 985–1002,
- New dynamic inequalities for Decreasing Functions and Theorems of Higher Integrability, SH Saker, D O’Regan, MM Osman, RP Agarwal, Annals of Applied Mathematics 42 (2), 1-13,2018.
- Opial and Polya type inequalities via convexity, SH Saker, DM Abdou, I Kubiaczyk, Fasciculi Mathematici 009, 2018 (11 citations).
- Fractional Hardy Type Inequalities via Conformable Calculus, SH Saker, D O’Regan, MR Kenawy, RP Agarwal, Memoirs on Differential Equations and Mathematical Physics 73, 131-140, 2018 (1 citation).
- Oscillation of impulsive neutral partial differential equations with distributed deviating arguments, T Kalaimani, T Raja, V Sadhasivam, SH Saker, Bul. Math. Soc. Sci. Math. Roumanie Tome 61 (109), 51-68, 2018 (8 citations).
- Applications of Delay Differential Equations in Biological Systems, FA Rihan, C Tunc, SH Saker, S Lakshmanan, R Rakkiyappan, Complexity, 2018 (8 citations).
- Distributions of zeros of solutions to first order delay dynamic equations, D O’Regan, SH Saker, AM Elshenhab, RP Agarwal, Advances in Difference Equations 2017 (1), 1-16, 2017.
- Some reverse dynamic inequalities on time scales, RP Agarwal, RR Mahmoud, D O’Regan, SH Saker, Bull. Aust. Math. Soc 96 (3), 445-454, 2017 (1 citation).
- On Hilbert’s inequality on time scales, SH Saker, AA El-Deeb, HM Rezk, RP Agarwal, Applicable Analysis and Discrete Mathematics 11 (2), 399-423, 2017 (14 citations).
- New Hilbert’s dynamic inequalities on time scales, SH Saker, AM Ahmed, HM Rezk, D O’Regan, RP Agarwal, Journal of Mathematical Inequalities & Applications 20 (40), 1017-1039, 2017 (7 citations).
- General higher-order dynamic Opial inequalities with applications, MJ Bohner, MM Osman, SH Saker, Dynamic Systems and Applications 26 (1), 65-80, 2017 (2 citations).
- A variety of inverse Hilbert type inequalities on time scales, SH Saker, HM Rezk, D O’Regan, RP Agarwal, Dynamics of Continuous, Discrete and Impulsive Systems Series A …, 2017 (8 citations).
- Oscillation Criteria for Second-Order Neutral Difference Equations via Third-Order Difference Equations, S Pinelas, SH Saker, MA Arahet, International Journal of Difference Equations 12 (1), 131-143, 2017 (1 citation).
- New generalizations of Németh–Mohapatra type inequalities on time scales, RP Agarwal, RR Mahmoud, SH Saker, C Tunç, Acta Mathematica Hungarica, 1-21, 2017 (7 citations).
- Some new generalized forms of Hardy’s type inequality on time scales, SH Saker, RR Mahmoud, MM Osman, RP Agarwal, Math. Ineq. Appl. 20 (2), 459–481, 2017 (14 citations).
- Qualitative Theory of Functional Differential and Integral Equations 2016, C Tunç, B Liu, LR Sanchez, M Ali Mohammady, OG Mustafa, SH Saker, Abstract and Applied Analysis 2017, 2017.
- Dynamic Shum inequality, R AGARWAL, M BOHNER, D O’REGAN, S SAKER, Turkish J. Math 41, 55 – 66, 2017 (2 citations).
- Approximate solution of linear and nonlinear fractional differential equations under m-point local and nonlocal boundary conditions, H Khalil, RA Khan, D Baleanu, SH Saker, Advances in Difference Equations 2016 (1), 1-28, 2016 (10 citations).
- Some Bennett-Copson type inequalities on time scales, SH Saker, RR Mahmoud, A Peterson, J. Math. Ineq 10, 471-489, 2016 (6 citations).
- Distribution of zeros of sublinear dynamic equations with a damping term on time scales, SH Saker, RR Mahmoud, Hacettepe Journal of Mathematics and Statistics 45 (2), 455-471,2016 (2 citations).
- A general dynamic inequality of Opial type, R Agarwal, M Bohner, D O’Regan, M Osman, SH Saker, Applied Mathematics and Information Sciences 10 (3), 875-879, 2016 (6 citations).
- Sneak-out principle on time scales, MJ Bohner, SH Saker, Journal of Math. Ineq. 10 (Number 2), 393–403, 2016 (6citations).
- Hardy and Littlewood inequalities on time scales, SH SAKER, D O REGAN, Bull. Mal. Math. Sci. Soc. 39:527–543 2016 (18 citations).
- New multiplicative higher order dynamic inequalities of Opialtype, SS Rabie, SH Saker, D O’REGAN, RP Agarwal, Math. Ineq. Appl. 19 (1), 33-49, 2016.
- Distribution of zeros and disconjugacy of fourth order differential equations, SH Saker, I Kubiaczyk, Mathematische Nachrichten 289 (1), 97-115, 2016 (6 citations).
- Hardy’s Type Integral Inequalities on Time Scales, SH Saker, D O’Regan, Appl. Math. Inf. Sci 9 (6), 2955-2962, 2015 (3 citations).
- Extensions of dynamic inequalities of Hardy’s type on time scales, SH Saker, D O’Regan, Mathematica Slovaca 65 (5), 993-1012, 2015 (8 citations).
- A new Picone’s dynamic inequality on time scales with applications, SH Saker, RR Mahmoud, A Peterson, Applied Mathematics Letters 48, 162-169,2015 (3 citations).
- Improvements of dynamic Opial-type inequalities and applications, M Bohner, RR Mahmoud, SH Saker, Dynam. Systems Appl 24 (1-2), 229-241, 2015 (9 citations).
- Some Hardy Type Inequalities with Weighted Functions via Opial Type Inequalities, RP Agarwal, D O’Regan, SH Saker, Advances in Dynamical Systems and Applications, 10 (1), 1-9, 2015 (8 citations).
- Opial-Type Inequalities with Two Unknowns and Two Functions on Time Scales, SS Rabie, SH Saker, D O’Regan, RP Agarwal, Vietnam Journal of Mathematics, 1-15, 2015 (1 citation).
- Some new Lyapunov-type inequalities for third order differential equations, JR GRAEF, R Mahmoud, SH Saker, E Tunç, Comm. Appl. Nonlinear Anal 22, 1-16, 2015 (3 citations).
- Some new Opial dymamic inequalities with weighted functions on time scales, SH SAKER, MM OSMAN, D O’REGAN, RP AGARWAL, Math. Ineq. Appl. 18 (3), 1171–1187, 2015 (5 citations).
- Some new inequalities on discrete time scales, SH SAKER, D O’REGAN, RP AGARWAL, Dynamic System Applications, 2015 (5 citations).
- Discrete, continuous, delta, nabla and diamond-alpha Opial inequalities, M Bohner, RR Mahmoud, SH Saker, Math. Ineq. Appl. 18 (3), 923–940, 2015 (14 citations)
- Weighted Hardy-Type Inequalities on Time Scales with Applications, SH Saker, RR Mahmoud, A Peterson, Mediterranean Journal of Mathematics, 1-22, 2015 (26 citations).
- Distributions of zeros of solutions for third-order differential equations with variable coefficients, SH Saker, MA Arahet, Mathematical Problems in Engineering 2015, 2015 (7 citations).
- Converses of Copson’s inequalities on time scales, SH SAKER, D O’REGAN, RP AGARWAL, Math. Ineq. Appl. 18 (Number 1), 241–254, 2015. (9 citations).
- Weak solutions for the dynamic equations x (∆ m)(t)= f (t, x (t)) on time scales, SH Saker, A Sikorska-Nowak, EJQTDE 2015 (1) , 2015.
- Dynamic Littlewood-Type Inequalities, RP Agarwal, M Bohner, SH Saker, Proceeding of American Math. Soc. 143 (2), 667–677, 2015, (19 citations).
- Extensions of dynamic inequalities of Hardy’s type on time scales, S. H. Saker, D. O’Regan, Mathematica Slovaca 65, 993-1012, 2015.
- A note on oscillation criteria for second-order neutral dynamic equations on isolated time scales, T Li, SH Saker, Comm. Nonlinear Sci. and Num. Simulation 19 (12), 4185-4188, 2014 (43 citations).
- Dynamic inequalities of Hardy and Copson type on time scales, SH Saker, D O’Regan, RP Agarwal, Analysis 34 (4), 391-402, 2014 (17 citations).
- Oscillation of fourth-order delay differential equations, C Zhang, T Li, SH Saker, Journal of Mathematical Sciences 201 (3), 296-309, 2014 (24 citations).
- Generalized Hardy, Copson, Leindler and Bennett inequalities on time scales, SH Saker, D O’Regan, R Agarwal, Mathematische Nachrichten 287 (5-6), 686-698, 2014 (26 citations).
- Distribution of zeros of solutions of self-adjoint fourth order differential equations, SH Saker, D O’Regan, Egyptian Journal of Basic and Applied Sciences 1 (1), 49-59,2014 (3 citations).
- A new class of dynamic inequalities of Hardy’s type on time scales, SH Saker, J Graef, Dyn. Syst. Appl 23 (1), 83-99, 2014 (14 citations).
- Dynamic inequalities on time scales: A Survey, SH SAKER, Journal of Fractional Calculus and Applications 3, 2014 (4 citations).
- Littlewood and Bennett Inequalities on Time Scales, SH Saker, D O’Regan, RP Agarwal, Mediterranean Journal of Mathematics, 1-15, 2014 (11 ciatations).
- Some new disconjugacy criteria for second order differential equations with a middle term, SH Saker, Bulletin mathématique de la Société des Sciences Mathématiques de Roumanie 2014 (4 ciatations).
- Hardy–Leindler Type Inequalities on Time Scales, SH Saker, Appl. Math. Infor. Sci. 8 (6), 2975-2981, 2014 (11 citations).
- Higher order dynamic inequalities on time scales. SH SAKER, RP AGARWAL, D O’REGAN, Math. Ineq. Appl. 17 (2), 461-472, 2014 (7 citations).
- Some dynamic inequalities of Hardy type on time scales, SH Saker, D O’Regan, RP Agarwal, Math. Ineq. Appl. 17 (3), 1183-1199, 2014 (14 citations).
- Properties of solutions of fourth-order differential equations with boundary conditions, SH Saker, R Agarwal, D O’Regan, Journal of Inequalities and Applications 2013 (1), 278, 2013 (11 citations).
- Applications of Opial inequalities on time scales on dynamic equations with damping terms, SH Saker, Mathematical and Computer Modelling (2013) 58 (11-12), 1777-1790, 2013 (15 citations).
- Oscillation criteria for nonlinear neutral functional dynamic equations on time scales, I Kubiaczyk, SH Saker, A Sikorska-Nowak, Mathematica Slovaca 63 (2), 263-290, 2013 (9 citations).
- Interval oscillation criteria for forced Emden-Fowler functional dynamic equations with oscillatory potential, DR Anderson, SH Saker, Science China Mathematics 56 (3), 561-576, 2013, (11 citations).
- Ocillation of third-order neutral dynamic equations on time scales, C Zhang, SH Saker, T Li, Dynamics of Continuous, Discrete and Impulsive Systems, Series B 20 (3), 333-358, 2013 (11 citations).
- Oscillation theory of third-order nonlinear functional differential equations, JR Graef, SH Saker, Hiroshima Mathematical Journal 43 (1), 49-72, 2013 (23 citations).
- Oscillation of third-order nonlinear neutral functional dynamic equations on time scales, SH Saker, JR Graef, Dynamic Systems and Applications 21 (4), 583, 2012 (15 citations).
- New gaps between zeros of fourth-order differential equations via Opial inequalities, SH Saker, RP Agarwal, D O’Regan, Journal of Inequalities and Applications 2012 (1), 1-19, 2012, (5 citations)
- Oscillation of a Certain Class of Third Order Nonlinear Difference Equations, SH Saker, Bulletin of the Malaysian Mathematical Sciences Society 35 (3), 651–669, 2012 (8 citations).
- Some Opial Dynamic Inequalities Involving Higher Order Derivatives on Time Scales, SH Saker, Discrete Dynamics in Nature and Society 2012 (2012), art. no. 157301, 2012 (10 citations).
- Gaps between zeros of second-order half-linear differential equations, SH Saker, RP Agarwal, D ’Regan, Applied Mathematics and Computation 219 (2012), 875-885, 2012 (5 citations).
- Oscillation criteria for quasi-linear functional dynamic equations on time scales, SH Saker, SR Grace, Mathematica Slovaca 62 (3), 501-524, 2012 (18 citations).
- Lyapunov’s Type Inequalities for Fourth-Order Differential Equations, SH Saker, Abstract and Applied Analysis 2012, 2012 (10 citations).
- New oscillation criteria for second-order neutral dynamic equations on time scales via Riccati substitution, SH Saker, D O’Regan, Hiroshima Mathematical Journal 42 (1), 77-98, 2012 (15 citations).
- New inequalities of Opial’s type on time scales and some of their applications, SH Saker, Discrete Dynamics in Nature and Society 2012, 2012 (23 citations).
- Opial’s type inequalities on time scales and some applications, SH Saker, Annal. Polon. Math 104 (2012), 243-260, 2012 (28 citations),
- Lyapunov type inequalities for a second order differential equation with a damping term, SH Saker, Annales Polonici Mathematici 103 (1), 37-57, 2012 (18 citations).
- New Hardy-Type Inequalities Via Opial Inequalities, SH Saker, arXiv preprint arXiv:1112.4122, 2011.
- Oscillation of third-order functional dynamic equations on time scales, SH Saker, Science China Mathematics 54 (12), 2597-2614, 2011 (34 citations).
- Dynamics and control of a system of two non‐interacting preys with common predator, G Zaman, SH Saker, Mathematical methods in the applied sciences 34 (18), 2259-2273, 2011 (5 citations).
- Applications of Opial and Wirtinger inequalities on zeros of third order differential equations, SH Saker, Dynamic Systems and Applications 20 (4), 479, 2011 (12 citations).
- Some dynamic Wirtinger-type inequalities and their applications, R Agarwal, M Bohner, D O’Regan, SH Saker, Pacific Journal of Mathematics 252 (1), 1-18, 2011 (33 citations).
- New oscillation criteria for third order nonlinear neutral difference equations, SH Saker, Mathematica Slovaca 61 (4), 579-600, 2011 (8 citations).
- Some nonlinear dynamic inequalities on time scales, SH Saker, Math. Inequal. Appl 14 (3), 633-645,2011 (41 citations).
- Some Opial-type inequalities on time scales, SH Saker, Abstract and Applied Analysis 2011, 2011 (20 citations).
- New oscillation criteria for second-order neutral dynamic equations on time scales via Riccati technique, SH Saker, D O’Regan, Hirosh. math. J 41, 1-22, 2011 (2 citations).
- On a difference equation with exponentially decreasing nonlinearity, E Braverman, SH Saker, Discrete Dynamics in Nature and Society 2011, 2011 (6 citations).
- Bounds of double integral dynamic inequalities in two independent variables on time scales, SH Saker, Discrete Dynamics in Nature and Society 2011, 2011 (6 citations).
- Asymptotic properties of third order functional dynamic equations on time scales, I Kubiaczyk, S Saker, Annales Polonici Mathematici 3 (100), 203-222, 2011 (5 citations).
- On oscillation of a certain class of third-order nonlinear functional dynamic equations on time scales, SH Saker, Bulletin mathématique de la Société des Sciences Mathématiques de Roumanie 54 (4), 365-389, 2011 (11 citations).
- Nonlinear dynamic inequalities of Gronwall-Bellman type on time scales, S Saker, Electronic Journal of Qualitative Theory of Differential Equations 2011 (86), 2011, (9 citations).
- Oscillation criteria for a second-order quasilinear neutral functional dynamic equation on time scales, SH Saker, Nonlinear Oscillations 13 (3), 407-428, 2011 (23 citations).
- Some Opial-type inequalities on time scales, SH Saker, Abstract and Applied Analysis 2011, 2011 (20 citations).
- New oscillation criteria for second-order neutral functional dynamic equations via the generalized Riccati substitution, SH Saker, D O’Regan, Communications in Nonlinear Science and Numerical Simulation 16 (1), 423-434, 2011 (64 citations).
- Some nonlinear dynamic inequalities on time scales and applications, SH Saker, Journal of Mathematical Inequalities 4 (4), 561-579, 2010 (41 citations).
- New oscillation criteria for generalized second-order nonlinear neutral functional differential equations, JR Graef, SH Saker, Dynamic Systems and Applications 19 (3), 455, 2010 (4 citations).
- Periodic solutions and global attractivity of a discrete delay host macroparasite model, E Braverman, SH Saker, Journal of Difference Equations and Applications 16 (7), 789-806, 2010 (8 citations).
- Stability and Hopf bifurcations of nonlinear delay malaria epidemic model, SH Saker, Nonlinear Analysis: Real World Applications 11 (2), 784-799, 2010 (22 citations).
- Compatibility of local and global stability conditions for some discrete population models, SH Saker, Nonlinear Dynamics 59 (3), 375-396, 2010 (3 citations).
- Oscillatory behavior of third order nonlinear difference equations with delayed argument, SH Saker, JO Alzabut, Dyn. Contin. Discrete Impuls. Syst. Ser. A Math. Anal 17, 707-723, 2010 (4 citations).
- Global attractivity of a multiplicative delay population dynamics model, E Braverman, SH Saker, Proc. Conference of Difference Eqns Appl., Lisbon 2010, 194-203, 2010
- OSCILLATION OF SECOND-ORDER FUNCTIONAL DYNAMIC EQUATIONS OF EMDEN-FOWLER-TYPE ON TIME SCALES, SH Saker, Journal of applied mathematics & informatics 28 (5_6), 1285-1304, 2010.
- Oscillation Theory of Delay Differential and Difference Equations: Second and Third Orders, S Saker, LAP Lambert Academic Publishing, 2010 (33 citations).
- Oscillation Theory of Dynamic Equations on Time Scales: Second and Third Orders, S Saker, LAP Lambert Academic Publishing, 2010 (47 citations).
- Oscillatory behavior of a certain class of second-order nonlinear perturbed dynamic equations on time scales, SH Saker, Journal of the Korean Mathematical Society 47 (4), 659-674, 2010 (3 citations).
- Global Stability and Oscillation of a Discrete Annual Plants Model, SH Saker, Abstract and Applied Analysis 2010, 2010.
- On the oscillatory behavior for a certain class of third order nonlinear delay difference equations, S Saker, JO Alzabut, A Mukheimer, Electronic Journal of Qualitative Theory of Differential Equations 2010 (67 ) 2010 (30 citations).
- Applications of Wirtinger inequalities on the distribution of zeros of the Riemann Zeta-function, SH Saker, Journal of Inequalities and Applications 2010 (2010), art. no. 215416, 2010 (14 citations).
- Lyapunov inequalities for half-linear dynamic equations on time scales and disconjugacy, SH Saker, Dyn. Contin. Discr. Impuls. Syst. Series B: Applications & Algorithms 18, 2010 (20 citations).
- On the oscillation of certain class of third-order nonlinear delay differential equations, SH Saker, J Džurina, Mathematica Bohemica 135 (3), 225-237, 2010, (27 citations).
- Interval oscillation criteria for forced second order nonlinear delay dynamic equations with oscillatory potential, L Erbe, TS Hassan, A Peterson, SH Saker, Dynamics of Continuous, Discrete, and Impulsive Systems, 17, pp. 533-542, 2010 (18 citations).
- Large spaces between the zeros of the Riemann zeta-function, SH Saker, arXiv preprint arXiv:0906.5458, 2009 (2 citations).
- Hille and Nehari types oscillation criteria for second-order neutral delay dynamic equations, SH Saker, Dyn. Contin. Discrete Impuls. Syst., Ser. B, Appl. Algorithms 16 (3), 349-360, 2009 (8 citations).
- On the impulsive delay hematopoiesis model with periodic coefficients, SH Saker, JO Alzabut, The Rocky Mountain Journal of Mathematics, 1657-1688, 2009 (27 citations).
- Oscillation criteria for a certain class of second-order neutral delay dynamic equations, SH Saker, Dynamics of Continuous, Discrete and Impulsive Systems Series B … (14 citations), 2009.
- Oscillation criteria for half-linear delay dynamic equations on time scales, L Erbe, TS Hassan, A Peterson, SH Saker, Nonlinear Dyn. Syst. Theory 9 (1), 51-68 (54 citations)
- Oscillation criteria for sublinear half-linear delay dynamic equations, L Erbe, TS Hassan, A Peterson, SH Saker, Int. J. Difference Equ 3 (2), 227-245 (44 citations)
- Oscillation criteria for a forced second-order nonlinear dynamic equation, L Erbe, A Peterson, SH Saker, Journal of Difference Equations and Applications 14 (10-11), 997-1009 (17 citations)
- Oscillation theorems for second-order nonlinear neutral delay dynamic equations on time scales, SH Saker, D O’regan, RP Agarwal, Acta Mathematica Sinica, English Series 24 (9), 1409-1432 (41 citations)
- OSCILLATION AND ASYMPTOTIC BEHAVIOR OF PERTURBED NONLINEAR DIFFERENCE EQUATIONS, SH Saker, PJY Wong, Indian J. pure appl. Math 39 (2), 105-122, 2008.
- Qualitative analysis of discrete nonlinear delay survival red blood cells model, SH Saker, Nonlinear Analysis: Real World Applications 9 (2), 471-489, (25 citations)
- Oscillation criteria for third-order nonlinear differential equations, B Baculíková, E Elabbasy, S Saker, J Džurina, Mathematica Slovaca 58 (2), 201-220 (51citations) 2008.
- On the Cushing–Henson conjecture, delay difference equations and attenuant cycles, E Braverman, SH Saker, Journal of Difference Equations and Applications 14 (3), 275-286 (17 citations) 2008.
- Oscillation and global attractivity in a delay periodic host macroparasite model, RP Agarwal, D O’Regan, SH Saker, Applied mathematics and computation 196 (1), 340-352 (6 citations)
- Periodic solutions, oscillation and attractivity of discrete nonlinear delay population model, SH Saker, Mathematical and Computer Modelling 47 (3-4), 278-297 (17 citations), 2008.
- Global existence of positive periodic solutions of two-dimensional logistic model for the interaction of demand and supply, EM Elabbasy, HN Agiza, SH Saker, Mansoura J. Mathematics 132 (1), 35-46, 2008.
- Oscillation theorems for second-order nonlinear neutral delay dynamic equations, SH Saker, Inter. J. Appl. Math. Stat. 3, 22-35, 2008.
- Oscillation of Perturbed Delay Dynamic Equations On Time Scales, SH Saker, Communications in Applied Analysis 12 (2), 209-220 (2 citations) 2008.
- Oscillation of superlinear and sublinear neutral delay dynamic equations, SH Saker, Communications in Applied Analysis 12 (2), 173 (13 citations)
- Permanence, oscillation and attractivity of the discrete hematopoiesis model with variable coefficients, E Braverman, SH Saker, Nonlinear Analysis: Theory, Methods & Applications 67 (10), 2955-2965, (36 citations), 2007.
- Oscillation and attractivity of discrete nonlinear delay population model, SH Saker, Journal of Applied Mathematics and Computing 25 (1), 363-374, (1 citations),
- Existence of periodic solutions, global attractivity and oscillation of impulsive delay population model, SH Saker, JO Alzabut, Nonlinear Analysis: real world applications 8 (4), 1029-1039, (38 citations), 2007
- Oscillation criteria for second-order nonlinear delay dynamic equations, L Erbe, A Peterson, SH Saker, Journal of Mathematical Analysis and Applications 333 (1), 505-522 (163 citations), 2007.
- Oscillation of second-order damped dynamic equations on time scales, SH Saker, RP Agarwal, D O’Regan, Journal of Mathematical Analysis and Applications 330 (2), 1317-1337, (73 citations), 2007.
- Oscillation and stability of nonlinear discrete models exhibiting the Allee effect, E Elabbasy, S Saker, H El-Metwally, Mathematica Slovaca 57 (3), 243-258, (5 citations), 2007.
- Oscillation of second-order delay and neutral delay dynamic equations on time scales, SH Saker, Dynamic Systems and Applications 16 (2), 345 (11 citations),
- Hille and Nehari type criteria for third-order dynamic equations, L Erbe, A Peterson, SH Saker, Journal of Mathematical Analysis and Applications 329 (1), 112-131 (105 citations), 2007.
- OSCILLATION CRITERIA OF SECOND-ORDER NONLINEAR NEUTRAL FUNCTIONAL DYNAMIC EQUATIONS ON TIME SCALES, SH Saker, Nonlinear Functional Anlaysis and Applications,
- Forced oscillation of higher order nonlinear difference equations, YG Sun, SH Saker, Applied mathematics and computation 187 (2), 868-872 (6 citations), 2007.
- Oscillation of second order nonlinear delay damped difference equations, SH Saker, BG Zhang, Acta Mathematica Sinica, English Series 23 (4), 715-722 (5 citations), 2007.
- Periodic solutions, global attractivity and oscillation of an impulsive delay host–macroparasite model, SH Saker, JO Alzabut, Mathematical and Computer Modelling 45 (5-6), 531-543 (20 citations),
- Oscillatory behavior of linear neutral delay dynamic equations on time scales, SH Saker, Kyungpook Mathematical Journal 47 (2), 175-190 (3 citations), 2007.
- Oscillation and Nonoscillation of Nonlinear Neutral Delay Differential Equations with Several Positive and Negative Coefficients, EM Elabbasy, TS Hassan, SH Saker, Kyungpook Mathematical Journal 47 (1), 1-20 (1 citations) 2007.
- Oscillation criteria of Hille and Nehari types for third-order delay differential equations, SH Saker, Communications in Applied Analysis 11 (3-4), 451-468, (13 citations),
- Philos-type oscillation criteria of second-order half-linear dynamic equations on time scales, RP Agarwal, D O’Regan, SH Saker, Rocky Mountain Journal of Math. 37 (2007), 1085-1104. (44 citations)
- Oscillation results for second-order nonlinear neutral delay dynamic equations on time scales, SH Saker, RP Agarwal, D O’regan, Applicable Analysis 86 (1), 1-17 (65 citations)
- Oscillation criteria for a certain class of second order Emden-Fowler dynamic equations, E Akin, SH Saker, M Bohner, American Mathematical Society (111 citations)
- Hille-Kneser-type criteria for second-order dynamic equations on time scales, L Erbe, A Peterson, SH Saker, Advances in Difference Equations 2006, 1-18 (20 citations)
- On the Oscillation of Second-order Perturbed Nonlinear Difference Equations, YG Sun, SH Saker, Dynamic Systems and Applications 15 (3/4), 537 (1 citations), 2006.
- Oscillation and asymptotic behavior of third-order nonlinear neutral delay difference equations, SH Saker, Dynamic Systems and Applications 15 (3/4), 549, (28 citations),
- Oscillation of second-order neutral delay dynamic equations of Emden-Fowler type, SH Saker, Dynamic Systems and Applications 15 (3/4), 629 (23 citations),
- Positive periodic solutions of discrete three-level food-chain model of Holling type II, YG Sun, SH Saker, Applied Mathematics and Computation 180 (1), 353-365 (40 citations)
- Oscillation of nonlinear neutral delay differential equations, EM Elabbasy, TS Hassan, SH Saker, Journal of Applied Mathematics and Computing 21 (1), 99-118 (5 citations)
- Oscillation of second-order nonlinear neutral delay dynamic equations on time scales, SH Saker, Journal of Computational and Applied Mathematics 187 (2), 123-141 (150 citations)
- Kamenev-type oscillation criteria for second-order linear delay dynamic equations, L Erbe, A Peterson, SH Saker, Dynamic Systems and Applications 15 (1), 65 (51 citations)
- Forced oscillation of higher-order nonlinear differential equations, YG Sun, SH Saker, Applied mathematics and computation 173 (2), 1219-1226 6 2006,
- New oscillation criteria for second-order nonlinear dynamic equations on time scales, SH Saker, Anal. Appl 11 (3), 351-370 (19 citations)
- Oscillation of damped second order nonlinear delay differential equations of Emden-Fowler type, M Bohner, SH Saker, Advances in Dynamical Systems and Applications 1 (2), 163-182 (13 citations)
- Oscillation of second order half-linear dynamic equations on discrete time scales, M Bohner, SH Saker, Int. J. Difference Equ 1 (2), 205-218 (10 citations)
- Properties of bounded solutions of nonlinear dynamic equations on time scales, RP Agarwal, D O’Regan, SH Saker, Canad. Appl. Math. Quart 14, 1-10, (14 citations)
- Oscillation criteria for nonlinear perturbed dynamic equations of second-order on time scales, RP Agarwal, D O’regan, SH Saker, Journal of Applied Mathematics and Computing 20 (1), 133-147, (29 citations), 2006.
- Oscillation criteria of third-order nonlinear delay differential equations, SH Saker, Mathematica Slovaca 56 (4), 433-450 (62 citations), 2006.
- Oscillation and asymptotic behavior of a third-order nonlinear dynamic equation, L Erbe, A Peterson, SH Saker, The Canadian Applied Mathematics Quarterly 14 (2), 129-147, (58 citations), 2006.
- Boundedness of solutions of second-order forced nonlinear dynamic equations, SH Saker, Rocky Mountain. J. Math 36 (6), 2027-2039 (35 citations), 2006.
- Periodic solutions and oscillation of discrete non-linear delay population dynamics model with external force, EM Elabbasy, SH Saker, IMA journal of applied mathematics 70 (6), 753-767, ( 15 citations), 2005.
- Oscillation and global attractivity of impulsive periodic delay respiratory dynamics model, SH Saker, Chinese Annals of Mathematics 26 (04), 511-522, (25 citations), 2005.
- Oscillatory and asymptotic behavior of positive periodic solutions of nonlinear discrete model exhibiting the Allee effect, YG Sun, SH Saker, Applied mathematics and computation 168 (2), 1205-1218, (6 citations), 2005.
- Existence of positive periodic solutions of nonlinear discrete model exhibiting the Allee effect, YG Sun, SH Saker, Applied mathematics and computation 168 (2), 1086-1097, (12 citations),
- Asymptotic behavior of solutions of a third-order nonlinear dynamic equation on time scales, L Erbe, A Peterson, SH Saker, Journal of Computational and Applied Mathematics 181 (1), 92-102, (101 citations), 2005.
- Oscillation of continuous and discrete diffusive delay Nicholson’s blowflies models, SH Saker, Applied mathematics and computation 167 (1), 179-197, (16 citations), 2005.
- Oscillation and global attractivity of a periodic survival red blood cells model, SH Saker, S Agarwal, J. Dyn. Contin. Disc. Impulsive Syst. Ser. B 12 (3-4), 429-440, (21 citations),
- Oscillation and global attractivity of a periodic survival red blood cells model, SH Saker, S Agarwal, Dynamics of Continuous, Discrete and Impulsive Systems Series B … (21 citations), 2005.
- Oscillation criteria of second-order half-linear dynamic equations on time scales, SH Saker, Journal of Computational and Applied Mathematics 177 (2), 375-387, (153 citations), 2005.
- Oscillation for second-order nonlinear neutral delay difference equations, YG Sun, SH Saker, Applied mathematics and computation 163 (2), 909-918, (46 citations), 2005.
- Dynamics of a class of non-autonomous systems of two non-interacting preys with common predator,EM Elabbasy, SH Saker, Journal of Applied Mathematics and Computing 17 (1), 195-215, (8 citations), 2005.
- Oseillation of Second order Delay Dynamic equations, RP Agarwal, M Bohner, SH Saker, Canadian App lied Mathematics Quarterly 13 (1), 1-18, (3 citations), 2005.
- Necessary and sufficient condition for oscillations of neutral differential equation, E Elabbasy, T Hassan, SH Saker, Serdica Mathematical Journal 31 (4), 279-290, (2 citations), 2005.
- ON MULTI-TEAM PREDATOR-PREY MODELS, MF Elettreby, SH Saker, E Ahmed, ICTP Reports 23, 1-9, (1 citations)
- Oscillation criteria of second-order half-linear delay difference equations, SH Saker, Kyungpook Mathematical Journal 45 (4), 579-594, (4 citations), 2005.
- Oscillation criteria for first-order nonlinear neutral delay differential equations, EM Elabbasy, TS Hassan, SH Saker, Electronic Journal of Differential Equations (EJDE)[electronic only] 2005 …(11 citations),
- Existence of positive periodic solutions of discrete models for the interaction of demand and supply, SH Saker, Nonlinear Funct. Anal. Appl 10, 311-324, (3 citations), 2005.
- Oscillation of second-order nonlinear differential equations with a damping term, EM Elabbasy, TS Hassan, S Saker, Electronic Journal of Differential Equations (EJDE)[electronic only] 2005 … (32 citations),
- Oscillation of second-order forced nonlinear dynamic equations on time scales, SH Saker, Electronic Journal of Qualitative Theory of Differential Equations 2005 (23 … (52 citations), 2005.
- Kamenev type oscillation criteria for nonlinear difference equations, SH Saker, SS Sheng, zechoslovak Mathematical Journal 54 (4), 955-967, (14 citations), 2004.
- Oscillation criteria for second-order nonlinear neutral delay dynamic equations, RP Agarwal, D O’Regan, SH Saker, Journal of Mathematical Analysis and Applications 300 (1), 203-217, (327 citations), 2004.
- Oscillation of second order nonlinear dynamic equations on time scales, M Bohner, SH Saker, The Rocky Mountain Journal of Mathematics, 1239-1254, (192 citations ), 2004.
- Oscillation criteria for perturbed nonlinear dynamic equations, M Bohner, SH Saker, Mathematical and computer modelling 40 (3-4), 249-260, (75 citations), 2004.
- Oscillation criteria for difference equations with damping terms, SH Saker, SS Cheng, Applied mathematics and computation 148 (2), 421-442, (26 citations), 2004.
- Oscillation of nonlinear dynamic equations on time scales, SH Saker, Applied Mathematics and Computation 148 (1), 81-91, (160 citations), 2004.
- Oscillation criteria for second order superlinear neutral delay differential equations, S Saker, J Manojlović, Electronic Journal of Qualitative Theory of Differential Equations 2004 (10 …(24 citations),
- Oscillation of parabolic neutral delay difference equations, SH Saker, Bulletin of the Korean Mathematical Society 41 (4), 619-632, (1 citation), 2004.
- Oscillation and asymptotic behavior of second-order nonlinear difference equations, I Kubiaczyk, SH Saker, Fasciculi Mathematici, 39-54, (2 citations), 2004.
- Oscillation of third-order difference equations, SH Saker, Portugaliae Mathematica 61 (3), 249-258, (36 citations), 2004.
- Oscillation of second-order sublinear neutral delay difference equations, WT Li, SH Saker, Applied Mathematics and Computation 146 (2-3), 543-551, (25 citations),
- Oscillation of second-order perturbed nonlinear difference equations, SH Saker, Applied mathematics and computation 144 (2-3), 305-324, (18 citations),
- Oscillation theorems for discrete nonlinear delay wave equations, I Kubiaczyk, SH Saker, ZAMM‐Journal of Applied Mathematics and Mechanics/Zeitschrift für Angewandte … (2 citations), 2003.
- Kamenev-type oscillation criteria for nonlinear neutral delay difference equations, BG Zhang, SH Saker, Indian Journal of Pure and Applied Mathematics 34 (11), 1571-1584, (23 citations),
- Oscillation of parabolic neutral delay difference equations with several positive and negative coefficients, SH Saker, Applied mathematics and computation 143 (1), 173-186, ( 7 citations), 2003.
- New oscillation criteria for first order nonlinear neutral delay differential equations, I Kubiaczyk, SH Saker, J Morchalo, Applied Mathematics and Computation 142 (2-3), 225-242, (28 citations),
- Oscillation and global attractivity in hematopoiesis model with periodic coefficients, SH Saker, Applied Mathematics and Computation 142 (2-3), 477-494, (32 citations), 2003.
- New oscillation criteria for second-order nonlinear neutral delay difference equations, SH Saker, Applied Mathematics and Computation 142 (1), 99-111, (59 citations) 2003.
- Oscillation theorems for second-order nonlinear delay difference equations, SH Saker, Periodica Mathematica Hungarica 47 (1), 201-213, ( 10 citations) 2003.
- Oscillation and global attractivity in a periodic delay hematopoiesis model, SH Saker, Journal of Applied Mathematics and Computing 13 (1), 287-300, (10 citations), 2003.
- Oscillation theorems for second order nonlinear functional differential equations with damping, SH Saker, PYH Pang, RP Agarwal, Dynamic Systems and Applications 12 (3/4), 307-322, (28 citations), 2003.
- Kamenev-type oscillation criteria for hyperbolic nonlinear neutral delay difference equations, SH Saker, Nonlinear Studies 10 (3), 221-236, ( 3 citations), 2003.
- Oscillation of higher order delay differential equations with applications to hyperbolic equations, I Kubiaczyk, Wan-Tong, SH Saker, INDIAN JOURNAL OF PURE & APPLIED MATHEMATICS 34 (8), 1259-127 (13 citations), 2003.
- Kamenev-type oscillation criteria for sublinear delay difference equations, I KUAczyk, SH Saker, J Morchalo, Indian J. pure appl. Math 34 (8), 1273-1284, (10 citations),
- Oscillation of second order neutral delay differential equations of Emden-Fowler type, S Saker, Acta Mathematica Hungarica 100 (1-2), 37-62, (30 citations),
- Oscillation Criteria for Second‐Order Nonlinear Dynamic Equations On Time Scales, L Erbe, A Peterson, SH Saker, Journal of the London Mathematical Society 67 (3), 701-714, (163 citations), 2003.
- Oscillation in a discrete partial delay survival red blood cells model, BG Zhang, SH Saker, Mathematical and computer modelling 37 (7-8), 659-664, (8 citations),
- Oscillation and global attractivity in hematopoiesis model with delay time, SH Saker, Applied Mathematics and Computation 136 (2-3), 241-250, (61 citations), 2003 .
- Oscillation of delay differential equation with several positive and negative coefficients, EM ELABBASY, SH SAKER, Discussiones Mathematicae: Differential inclusions, control and optimization …
- Oscillation Theorems for Second Order Nonlinear Functional Differential Equations with amping, SH Saker, PYH Pang, RP Agarwal, Dynamic Sys. Appl 12, 307-322, ( 28 citations),
- Oscillation and global attractivity of a periodic survival red blood cells model, S Agarwal, SH Saker, J. Dyn. Continuous, Discrete Impulsive Syst. Series B: Appl. Algorithms
- Oscillation criteria of hyperbolic nonlinear differential equations with deviating arguments, SH Saker, Publ. Math. Debr. 62, 165-185, (18 citations), 2003.
- Oscillation of solutions of a pair of coupled nonlinear delay differential equations, SH Saker, Portugaliae Mathematica 60 (3), 319-336, (1 citation)
- Oscillation of delay differential equations with several positive and negative coefficients, EM Elabbasy, SH Saker, Disc. Math. Different. Inclusion 23, 39-52, (2 citations),
- Kamenev-type oscillation criteria for hyperbolic delay difference equations, I Kubiaczyk, SH Saker, Demonstratio Mathematica 36 (1), 113-122, (5 citations), 2003.
- Nonexistence of unbounded nonoscillatory solutions of nonlinear perturbed partial difference equations, SH Saker, PJY Wong, J. Concrete and Applicable Math 1 (1), 87-99, (4 citations)
- Oscillation theorems of nonlinear difference equations of second order, SH Saker, Georgian Mathematical Journal 10 (2), 343-352, (9 citations), 2003.
- Oscillation of second order nonlinear delay difference equations, SH Saker, Bulletin of the Korean Mathematical Society 40 (3), 489-501, ( 22 citations),
- Oscillation and global attractivity in a discrete survival red blood cells model, I Kubiaczyk, SH Saker, Applicationes Mathematicae 30, 441-449, (16 citations)
- Oscillation of solutions to nonlinear neutral delay differential equations, SH Saker, I Kubiaczyk, Journal of Applied Analysis 8 (2), 261-278 (2 citations) 2002.
- Oscillation in a discrete partial delay Nicholson’s blowflies model, SH Saker, BG Zhang, Mathematical and computer modelling 36 (9-10), 1021-1026, ( 14 citations), 2002.
- Oscillation of delay parabolic differential equations with several coefficients, I Kubiaczyk, SH Saker, Journal of computational and applied mathematics 147 (2), 263-275, (13 citations),
- Oscillation of parabolic delay differential equations, I Kubiaczyk, SH Saker, Demonstratio Mathematica 35 (4), 791-802 (2 citations), 2002.
- Oscillation and global attractivity in a nonlinear delay periodic model of respiratory dynamics, SH Saker, S Agarwal, Computers & Mathematics with Applications 44 (5-6), 623-632, (48 citations), 2002.
- Oscillation and global attractivity in a periodic Nicholson’s blowflies model, SH Saker, S Agarwal, Mathematical and computer modelling 35 (7-8), 719-731, (117 citations),
- Oscillation of higher order neutral delay differential equations with variable coefficients, SH Saker, Dynamic Systems and Applications 11 (1), 107-125, (5 citations), 2002.
- Oscillation and stability in nonlinear delay differential equations of population dynamics, I Kubiaczyk, SH Saker, Mathematical and computer modelling 35 (3-4), 295-301, (63 citations),
- scillation Theorems for second order sublinear delay difference equations., Kubiaczyk, SH Sekar, Mathematica Slovaca 52, 343-359, (5 citations),
- Oscillation of parabolic delay differential equations with positive and negative coefficients, I Kubiaczyk, SH Saker, Annales Societatis Mathematicae Polonae. Seria 1: Commentationes … (1 citation), 2002.
- New oscillation ciriteria of first order delay differential equations, I Kubiaczyk, SH Saker, Demonstratio Mathematica. Warsaw Technical University Institute of … 2002,.
- Oscilltion of solutions to impulsive delay differential equations, WT Li, SH Saker, Annales Societatis Mathematicae Polonae. Seria 1: Commentationes … (1 citation)
- Oscillation of nonlinear neutral delay difference equations, SH Saker, International Journal of Pure and Applied Mathematics 1 (4), 455-465, (4 citations),
- Oscillation of solutions to neutral delay differential equations, I Kubiaczyk, SH Saker, Mathematica Slovaca 52 (3), 343-359, (13 citations), 2002.
- Oscillation of nonlinear neutral delay differential equations of second order, I Kubiaczyk, S Saker, Discussiones Mathematicae, Differential Inclusions, Control and Optimization … (5 citations)
- Kamenev-type oscillation criteria for forced Emden-Fowler superlinear difference equations, SH Saker, Electronic Journal of Differential Equations (EJDE)[electronic only] 2002 … (14 citations)
- Oscillation and global attractivity in a nonlinear delay periodic model of population dynamics, SH Saker, S Agarwal, Applicable Analysis 81 (4), 787-799, (27 citations)
- Oscillation and Global Attractivity in a Nonlinear Delay Periodic Model of Population Dynamics, RP Gilbert, SH Saker, S Agarwal, Mathematics Preprint Archive 2001 (12), 305-324,
- Oscillation of Solutions to Neutral Delay Dioeerential Equations with Positive and Negative Coefficients, RP Agarwal, SH Saker, Mathematics Preprint Archive 2001 (11), 579-610, (11 citations)
- Oscillation of Parabolic Dealy Diɶerential Equations with Positive and Negative Coeɶcients, I Kubiaczyk, SH Saker, Mathematics Preprint Archive 2001 (11), 611-636
- Oscillation of first order neutral delay differential equations, EM. Elaabsy,SH Saker, Kyungpook mathematical journal 41 (2), 311-311, (14 citations), 2001.
- Oscillation Of Solutions To Neutral Delay Differential Equations With Positive And Negative Coefficients, SH Saker, RP Agarwal, International Journal of Differential Equations and Applications 2, 449-465, 2001.
- Oscillation of nonlinear neutral delay differential equations with applications, WT Li, S Saker, Annales Polonici Mathematici 1 (77), 39-51, (6 citations),
- Oscillation of solutions to delay differential equations with positive and negative coefficients, EM Elabbasy, AS Hegazi, SH Saker, Texas State University, Department of Mathematics, (30 citations), 2000.
- Oscillation in host macroparasite model with delay time, EM Elabbasy, SH Saker, K Saif, Far East Journal of Applied Mathematics 4 (2), 119-142, (11 citations), 2000.
- Oscillation of nonlinear delay differential equations with several positive and negative coefficients, SHS E. M. Elabbasy, Kyungpook Mathematical Journal 39, 366-376, (9 citations), 1999.
- Oscillation of nonlinear delay differential equations with application to models exhibiting the Allee effect, EM Elabbasy, SH Saker, K Saif, Far East Journal of Mathematical Sciences 1, 603-620, (9 citations), 1999.
- Oscillation of solutions of delay differential equations, EM Elabbasy, SH Saker, M. Sc. thesis, Mansoura University, Egypt( (2 citations), 1997.

__ __

### Awards & Honorable Mentions

- Professor Saker's name has been included in the list released in 2020 by the US-based Stanford University of the World's Top 2% of the most-cited Scientists in various disciplines based on data from Scopus that ranks journals and gives a citation index. Click here
- Khalifa Award as a distinguished professor of scientific research on Arabic Countries, United Arab Emirates. 2020
- Academic Excellence Award (Mansoura University, Egypt). 2020
- The privilege of the first class from the president of Egypt. 2016
- Abdul Hameed Shoman Award for Young Arab Scientists, Mathematics (Abdul Hameed Shoman Foundation, Jordan) for contribution in developing the Arabic Scientific community and for the authenticity, originality of the publications. 2013
- National State Prize on Basic Science-Research and Technology (Egyptian Academy of Scientific, Egypt). 2005
- State Incentive Award in Mathematics (Mansoura University, Egypt). 2006
- Mohamed Amin Lotfy Award on Basic Science (Mathematical Science), Egyptian Academy of Scientific Research and Technology (Egypt). 2010
- State Incentive Award in Mathematics (Mansoura University, Egypt). 2013
- (Mathematical Science), Egyptian National State Prize on Basic Science-Academy of Scientific Research and Technology (Egypt). 2014
- State Incentive Award in Mathematics, (Mansoura University, Egypt). 2015

### Academic Positions

- Professor and coordinator of Mathematics, Mathematics Division, Faculty of Advanced Basic Science, Mansoura University from 21/10/2020 till now.
- Professor of Mathematics, Department of Mathematics, Faculty of Science, Mansoura University 1-Dec-13 l 20-Oct-20.
- Associate Professor of Mathematics, Department of Mathematics, Faculty of Science, Mansoura University 31-Aug-08 l 30-Nov-13.
- Assistant Professor of Mathematics, Department of Mathematics, Faculty of Science, King Saud University, Aug-06 l June-12.
- Assistant Professor of Mathematics, Department of Mathematics, Faculty of Science, Mansoura University, 20-July-03 l 31-Aug-08.
- Assistant Lecturer of Mathematics, Department of Mathematics, Faculty of Science, Mansoura University from 17-Jan-98 l 19-July-03.
- Demonstrator of Mathematics, Department of Mathematics, Faculty of Science, Mansoura University from 17-Dec-94 l 16-Jan-98.

**SCHOLARSHIPS AND GRANTS**

- Ph. D. Scholarship, Adam Mickiewicz University, Poznan, Poland. (Feb-01 l Dec-02)
- IKY Postdoctoral Scholarship, Department of Mathematics, University of Ioannina, Greece (March-04 l Aug-04),
- Fulbright Postdoctoral Scholarship, Department of Mathematics, Trinity University, San Antonio, Texas, USA (March-05 l Aug-05).
- Postdoctoral-Fellowship, University of Calgary, Department of Mathematics, Canada, (Feb-06 l Jan-07).
- Postdoctoral-Fellowship (TUBTUK, University of Yuzuncu Yil, Department of Mathematics, Turkey, (July-22 l Aug-16).

### Supervision

**SUPERVISIONS (M. SC.)**

- Title: A Study of Some Dynamic Inequalities on Time Scales.

Researcher: Mahmoud Mohamed Osman Ahmed Elnezlawy, Registration date: 18/8/13 – Awarding date:29/6/16. - Title: On Opial inequalities and some applications

Researcher: Safi H. Rabie, Registration date: 10/12/12 – Awarding date: 22/2/16. - Title: Asymptotic behavior of dynamic equations on time scales.

Researcher: Ahmed Mahmoud Elshenhab Mohamed Elshenhab, Registration date: 24/1/16. - Title: Some Dynamic Inequalities with Weighted Functions on Time Scales

Researcher: Ahmed Ibrahim Mohammed Mahmoud Abo Saied, Registration date: 13/7/16 - Title: Qualitative analysis of some nonlinear discrete models

Researcher: Shaimaa Ismail, Registration date: 20/9/15 - Title: Studies on some dynamic inequalities and their applications.

Researcher: Doaa M. M. Abdo, Registration date: 1/3/15

**SUPERVISIONS (PH. D.)**

- Title: Asymptotic behavior of some functional differential equations

Researcher: Taher S. Hassan, Registration date: 29/5/2001 – Awarding date: 20/10/2003 - Title: Dynamic Inequalities on Time Scales

Researcher: Ramy Ramadan Mahmoud Mohammed, Registration date: 21/10/2013 – Awarding date: 31/5/2016 - Title: Asymptotic Behavior of Solutions of Third Order Functional Differential Equations

Researcher: Mohammad Ali Mohammad Alrahet (From Yemen), Registration date: 29/4/2014. - Title: Hilbert’s and Hardy’s Type Inequalities on Time Scales

Researcher: Haytham Mohammed Rezk Ahmed, Registration date: 1/3/2016 - Title: Ostrowski-Gruss-Type Inequalities on Time Scales

Researcher: Al-Taher Ali Ghareeb Abdel-Latif, Registration date: 1/3/2016 - Title: On Some Fractional Inequalities

Researcher: Mohammed Ragab Zaki Kenawy, Registration date: 20/6/2016 - Title: A Study on weighted Hardy Type Inequalities

Researcher: Safi H. Rabie, Registration date: 15/10/2016 - Title: Studies on Some Dynamic Inequalities related to Hardy’s Inequality.

Researcher: Mahmoud Mohamed Osman Ahmed Elnezlawy, Registration date: 6/11/2016

### Job Grades

• Manager of IT Unite, Faculty of Science, Mansoura University. Oct-20 l Oct-21

• Faculty Council Member, Faculty of Science (on behalf of Mathematics Department). Sep-15 l Oct-16

• Faculty Council Member, Faculty of Science, (As an IT unite Manager) Oct-13 l Oct-16

• Coordinator of the Mathematics Department in Preparatory Year, King Saud University. 2007 l 2012

• Custodian of National Committee of Mathematics, Academic of Scientific Research and Technology, Egypt. Oct-13 l Nov-16

• Member of National Committee of Mathematics, Academic of Scientific Research and Technology, Egypt. Oct-03 l Nov-1

### Activities

- Member of American Mathematical Society.
- Member of European Mathematical Society.
- Member of Egyptian Mathematical Society.
- Member of International Society of Difference Equations.
- Member of African Mathematical Union, AMU.
- Reviewer of Zentralblatt MATH.
- Reviewer of Mathematical Review (Amer. Math. Soc., No. 37334)
- Deputy Editor of Afrika Matematika (African Math Union)
- Associate Editor of:

– Egyptian Journal of Basic and Applied Sciences – Elsevier

– Journal of the Egyptian Mathematical Society – Elsevier

– Journal of Inequalities and Applications

– Beni-Suef University Journal of Basic and Applied Sciences – Elsevier - Editorial Board of:

– Journal of Mathematics and Statistics

– International Journal of Applied Mathematics & Statistics (IJAMAS),

– Journal of Contemporary Mathematics.

– Journal of Applied Sciences.

– International Journal of Differential equations, Hindawi publisher.

– Advances in Pure Mathematics.

– Journal of Applied Mathematics, Hindawi publisher.

– Electronic J. Math. Analysis Applications.

– Journal of Fractional Calculus and Applications.

– Ilirias Journal of Mathematics, ISSN 2334-6574

**CONFERENCES AND SCHOOLS:**

(MORE THAN 20 INTERNATIONALAND NATIONAL CONFERENCES)

- International school of history of Mathematics, Mansoura 1999.
- Mathematics and the 21st Century, Cairo – Egypt 15-20 January 2000.
- International Conference of Topological Methods in Nonlinear Analysis, the Mathematical Conference Center, Badlevo, Poland, 18-23 June, 2001.
- Czechoslovak International Conference on Differential Equations and Their Applications, EQUADIFF 10, Prague, Czech Republic, August 27- 31, 2001.
- School on Population Dynamics, the Mathematical Conference Center, Badlevo, Poland June 17-21, 2002.
- Conference on Mathematical Modeling of population Dynamics, the Mathematical Conference Center, Badlevo, Poland, June 24-28, 2002.
- Workshop on Periodicities in Difference Equations, University of Ioannina, Greece, June 5, 2004.
- Texas Dynamics Systems Workshop, Trinity University, San Antonio, USA, April 8-9, 2005.
- International Conference on mathematical Analysis and its Applications, Assiut-Egypt, 3-6 January 2006.
- Canadian Mathematical Society Summer 2006 Meeting, University of Calgary, Calgary, Alberta, Canada, June 3-5, 2006.
- Workshop of computation and Modeling: Methods and Applications, King Abdul Aziz City for Science and Technology, Riyadh, January 23, 2007.
- Third Saudi Science Conference (New Horizons in Science and their Applications) College of Science – King Saud University 10-13th March 2007 (20-23/1428 H).
- Workshop of Partial differential equations in modern mathematical physics and applied mathematics, King Abdul Aziz City for Science and Technology, Riyadh, February 13, 2007.
- The third international conference on Mathematical Sciences-ICM 2008, March 3-6 (2008).
- First International Conference for E-Learning and Distance Learning, held in Al Faisaliah Hotel, Riyadh, Saudi Arabia from 16-18 March 2009.
- Progress of Difference equations 2009, Badlevo, Poland, May 24-29, 2009.
- Second International Conference of e-learning and Distance Learning (2011) held in Al Faisaliah Hotel, Riyadh, Saudi Arabia from 21-24 February 2011.
- International Conference on Mathematics, Trends and Development, 27 — 29 December 2012, Cairo, Egypt.
- 4th. Symposium of the FRACTIONAL CALCULUS AND APPLICATIONS GROUP, Faculty of Science — Alexandria University, on Wednesday 11th of July, 2012.
- 5th. Symposium of the FRACTIONAL CALCULUS AND APPLICATIONS GROUP “Faculty of Science — Alexandria University, on 3ed. of July, 2013. (Invited Speaker)
- The Nineteenth International Conference on Difference Equations and Applications, Sultan Qaboos University, Muscat, Oman, May 26 – 30, 2013.
- 6th. Symposium of the FRACTIONAL CALCULUS AND APPLICATIONS GROUP “Faculty of Science — Alexandria University, on 4-August, 2014. (Invited Speaker)
- The First National Conference on Mathematics, and its Applications, 14 — 16 Dec. 2014, Cairo, Egypt. (Organizer and invited speaker).
- International Conference for Mathematics & Its Applications, ICM&A, December 27-29, 2015, Egypt (Organizing Committee and invited Speaker).
- Member of Scientific Committee of 4th International Conference on Mathematics and Information Sciences, Feb. 09-11, 2017, Egypt.
- Member of Scientific Committee of 5th International Conference on Mathematics and Information Sciences, Feb. 09-11, 2017, Egypt. (invited Speaker)
- Member of Scientific Committee of 6th International Conference on Mathematics and Information Sciences, Feb. 09-11, 2017, Egypt. (Invited Speaker)
- International Conference on, Mathematics Statistics Information Technology, Tanta University, December 20-22, 2016, Egypt (invited speaker).
- Member of Scientific Committee and invited speaker of the Second National Conference on Mathematics, and its Applications, 3-5 April. 2017, Cairo, Egypt.
- PACOM 2017, 3-7 July, Morocco, Rabat (invited speaker).
- Member of Scientific Committee and invited speaker of the Second National Conference on Mathematics, and its Applications, 5-7 April. 2018, MUST, Cairo, Egypt.
- International Arabic Conference of Mathematics and Computation, Zarqa University 24-26 April 2019, invited speaker (keynote speaker).

# LET`S CONNECT

**Video Conference**

Zoom: Guofficial2020@gmail.com

**Mail**

info@gu.edu.eg

**Campus Location**

Galala Plateau , Attaka , Suez