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Other IDs

ResearcherID: A-1011-2009
Scopus Author ID: 56550216700

Countries

Kuwait

Biography

Dr. Zafer is a professor of mathematics specializing in ordinary and functional differential equations, difference equations, impulsive systems, and dynamic equations on time scales. His work has been applied to nonlinear oscillation theory, boundary value problems, and mathematical modeling. He has published more than 150 papers and received more than 2000 citations. He also serves as an associate editor in several journals.

Activities

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Employment (4)

American University of the Middle East: Al Ahmadi, KW

2013-01-18 to present
Employment
Source: Self-asserted source
Agacik Zafer

Middle East Technical University: Ankara, Ankara, TR

1993-03-15 to 2016-10-01 | Faculty member (Mathematics )
Employment
Source: Self-asserted source
Agacik Zafer

Iowa State University: Ames, Iowa, US

1989-05 to 1992-12 | Teaching Assistant (Mathematics)
Employment
Source: Self-asserted source
Agacik Zafer

Istanbul Technical University : Istanbul, TR

1985-10 to 1986-12 | Teaching Assistant (Mathematics)
Employment
Source: Self-asserted source
Agacik Zafer

Education and qualifications (3)

Iowa State University: Ames, IA, US

1989-05-15 to 1992-12-20 | PhD (Mathematics)
Education
Source: Self-asserted source
Agacik Zafer

Iowa State University: IA, IA, US

1987 to 1989 | MS (Mathematics )
Education
Source: Self-asserted source
Agacik Zafer

Istanbul Technical University: Istanbul, TR

1981 to 1985 | BS (Mathematics)
Education
Source: Self-asserted source
Agacik Zafer

Professional activities (1)

American Mathematical Society: RI, RI, KW

1995-04-04 to present | Individual (Math)
Membership
Source: Self-asserted source
Agacik Zafer

Works (50 of 116)

Items per page:
Page 1 of 3

Improvements on the Leighton‐type oscillation criteria for impulsive differential equations and extension to non‐canonical case

Mathematical Methods in the Applied Sciences
2025-03-15 | Journal article
DOI: 10.1002/mma.10605
Contributors: A. Zafer; S. Doğru Akgöl
Source: check_circle
Crossref

Wong type oscillation criteria for nonlinear impulsive differential equations

Mathematical Methods in the Applied Sciences
2023-03-30 | Journal article
DOI: 10.1002/mma.8812
Contributors: Sibel D. Akgöl; Agacik Zafer
Source: check_circle
Crossref

Lyapunov-type inequalities for higher-dimensional Hamiltonian systems on time scales: A new generalized vector zero approach

Journal of Mathematical Analysis and Applications
2022-08 | Journal article
DOI: 10.1016/j.jmaa.2022.126177
Contributors: Z. Kayar; A. Zafer
Source: check_circle
Crossref

Wong Type Oscillation Criteria for Nonlinear Impulsive Differential Equations

2022-04-06 | Preprint
DOI: 10.22541/au.164923025.59284277/v1
Contributors: A. Zafer; Sibel Dogru Akgol
Source: check_circle
Crossref

Leighton and Wong type oscillation theorems for impulsive differential equations

Applied Mathematics Letters
2021-11 | Journal article
DOI: 10.1016/j.aml.2021.107513
Contributors: S.D. Akgöl; A. Zafer
Source: check_circle
Crossref

On Oscillation of Second Order Delay Differential Equations with a Sublinear Neutral Term

Mediterranean Journal of Mathematics
2020-08 | Journal article
DOI: 10.1007/s00009-020-01538-y
Contributors: Said R. Grace; Irena Jadlovská; Agacik Zafer
Source: check_circle
Crossref

Oscillatory behavior of $n$-th order nonlinear delay differential equations with a nonpositive neutral term

Hacettepe Journal of Mathematics and Statistics
2020-04-02 | Journal article
DOI: 10.15672/hujms.471023
Contributors: Said R. GRACE; İrena JADLOVSKA; Zafer AĞACIK
Source: check_circle
Crossref

On oscillation of third-order noncanonical delay differential equations

Applied Mathematics and Computation
2019-12 | Journal article
DOI: 10.1016/j.amc.2019.06.044
Contributors: Said R. Grace; Irena Jadlovská; Agacik Zafer
Source: check_circle
Crossref

Lower bounds for the eigenvalues of first-order nonlinear Hamiltonian systems on time scales

Applied Mathematics Letters
2019-04 | Journal article
DOI: 10.1016/j.aml.2018.10.027
Contributors: Qingkai Kong; Ağacık Zafer
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

On oscillation of integro-differential equations

Turkish Journal of Mathematics
2018 | Journal article
DOI: 10.3906/mat-1612-21
EID:

2-s2.0-85040866589
Contributors: Grace, S.R.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Asymptotic representation of solutions for second-order impulsive differential equations

Applied Mathematics and Computation
2018-09 | Journal article
DOI: 10.1016/j.amc.2018.03.086
Contributors: S. Doğru Akgöl; A. Zafer
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Boundary value problems on half‐line for second‐order nonlinear impulsive differential equations

Mathematical Methods in the Applied Sciences
2018-09-30 | Journal article
DOI: 10.1002/mma.5089
Contributors: S.D. Akgol; A. Zafer
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Asymptotic integration of second-order impulsive differential equations

Applied Mathematics Letters
2018-02 | Journal article
DOI: 10.1016/j.aml.2017.07.010
Contributors: S.D. Akgöl; A. Zafer
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

A fixed point approach to singular impulsive boundary value problems

AIP Conference Proceedings
2017 | Conference paper
DOI: 10.1063/1.4992310
EID:

2-s2.0-85026653768
Contributors: Akgöl, S.D.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Asymptotic integration of higher order nonlinear delay differential equations via principal solutions

Asymptotic Analysis
2017 | Journal article
DOI: 10.3233/ASY-161406
EID:

2-s2.0-85012982986
Contributors: Agarwal, R.P.; Ertem, T.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

On the asymptotic behavior of nonoscillatory solutions of certain fractional differential equations

European Physical Journal: Special Topics
2017 | Journal article
DOI: 10.1140/epjst/e2018-00043-1
EID:

2-s2.0-85050378369
Contributors: Grace, S.R.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Oscillation criteria for a certain class of fractional order integro-differential equations

Hacettepe Journal of Mathematics and Statistics
2017 | Journal article
DOI: 10.15672/HJMS.20164518619
EID:

2-s2.0-85018720065
Contributors: Aslıyüce, S.; Feza Güvenilir, A.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Wong’s Oscillation Theorem for the Second-Order Delay Differential Equations

Journal of Mathematical Sciences (United States)
2017 | Journal article
DOI: 10.1007/s10958-017-3301-z
EID:

2-s2.0-85014651110
Contributors: Özbekler, A.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Oscillation criteria for odd‐order nonlinear delay differential equations with a middle term

Mathematical Methods in the Applied Sciences
2017-09-30 | Journal article
DOI: 10.1002/mma.4377
Contributors: S. R. Grace; I. Jadlovská; A. Zafer
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Lyapunov-type inequalities for nonlinear impulsive systems with applications

Electronic Journal of Qualitative Theory of Differential Equations
2016 | Journal article
DOI: 10.14232/ejqtde.2016.1.27
EID:

2-s2.0-84975275409
Contributors: Kayar, Z.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Matrix measure approach to Lyapunov-type inequalities for linear Hamiltonian systems with impulse effect

Journal of Mathematical Analysis and Applications
2016-08 | Journal article
DOI: 10.1016/j.jmaa.2016.03.043
Contributors: Z. Kayar; A. Zafer
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Oscillation criteria for nth‐order nonlinear delay differential equations with a middle term

Mathematical Methods in the Applied Sciences
2016-04 | Journal article
DOI: 10.1002/mma.3559
Contributors: S. R. Grace; A. Zafer
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Asymptotic integration of second-order nonlinear delay differential equations

Applied Mathematics Letters
2015 | Journal article
DOI: 10.1016/j.aml.2015.03.016
EID:

2-s2.0-84929072931
Contributors: Agarwal, R.P.; Ertem, T.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Recent trends in boundary value problems 2014

2015 | Journal article
DOI:

10.1155/2015/261754

EID:

2-s2.0-84924546596
Contributors: Ahmad, B.; Nieto, J.J.; O'Regan, D.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Functional differential and difference equations with applications 2013

2014 | Journal article
DOI:

10.1155/2014/543797

EID:

2-s2.0-84901815738
Contributors: Diblík, J.; Braverman, E.; Györi, I.; Rogovchenko, Y.; Růžičková, M.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Oscillatory and asymptotic behavior of solutions for second-order nonlinear integro-dynamic equations on time scales

2014 | Journal article
EID:

2-s2.0-84899141789
Contributors: Agarwal, R.P.; Grace, S.R.; O'Regan, D.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Oscillatory behavior of integro-dynamic and integral equations on time scales

2014 | Journal article
DOI:

10.1016/j.aml.2013.09.008

EID:

2-s2.0-84888382969
Contributors: Grace, S.R.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Stability criteria for linear Hamiltonian systems under impulsive perturbations

2014 | Journal article
DOI:

10.1016/j.amc.2013.12.128

EID:

2-s2.0-84893134971
Contributors: Kayar, Z.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Asymptotic integration of second-order nonlinear differential equations via principal and nonprincipal solutions

Applied Mathematics and Computation
2013 | Journal article
DOI:

10.1016/j.amc.2012.11.094
Contributors: Ertem, T.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Forced Oscillation of Second-Order Impulsive Differential Equations with Mixed Nonlinearities

2013 | Conference paper
DOI:

10.1007/978-1-4614-7333-6_13

EID:

2-s2.0-84893617525
Contributors: Özbekler, A.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Global existence and boundedness for a class of second-order nonlinear differential equations

Applied Mathematics Letters
2013 | Journal article
DOI:

10.1016/j.aml.2013.04.006
Contributors: Tiryaki, A.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Impulsive boundary value problems for planar hamiltonian systems

2013 | Journal article
DOI:

10.1155/2013/892475

EID:

2-s2.0-84893687391
Contributors: Kayar, Z.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Lyapunov-type inequalities for planar linear dynamic Hamiltonian systems

Applicable Analysis and Discrete Mathematics
2013 | Journal article
DOI:

10.2298/AADM130211004B
Contributors: Bohner, M.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Monotone positive solutions for a class of second-order nonlinear differential equations

Journal of Computational and Applied Mathematics
2013 | Journal article
DOI:

10.1016/j.cam.2013.04.020
Contributors: Ertem, T.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Oscillation of even order nonlinear delay dynamic equations on time scales

Czechoslovak Mathematical Journal
2013 | Journal article
DOI:

10.1007/s10587-013-0017-1
Contributors: Erbe, L.; Mert, R.; Peterson, A.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Oscillation of integro-dynamic equations on time scales

Applied Mathematics Letters
2013 | Journal article
DOI:

10.1016/j.aml.2012.10.001
Contributors: Grace, S.R.; Graef, J.R.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Oscillation of nonlinear elliptic inequalities with p(x)-Laplacian

Complex Variables and Elliptic Equations
2013 | Journal article
DOI:

10.1080/17476933.2012.686493
Contributors: Zafer, A.; Şahiner, Y.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Oscillation of p(x)-Laplacian elliptic inequalities with mixed variable exponents

2013 | Journal article
DOI:

10.7153/mia-16-74

EID:

2-s2.0-84884219549
Contributors: Şahiner, Y.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Oscillatory behavior of higher-order neutral type dynamic equations

Electronic Journal of Qualitative Theory of Differential Equations
2013 | Journal article
EID: 2-s2.0-84878411852
Contributors: Grace, S.R.; Mert, R.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Recent trends in boundary value problems

2013 | Journal article
DOI:

10.1155/2013/431375

EID:

2-s2.0-84888363698
Contributors: Ahmad, B.; Nieto, J.J.; O'Regan, D.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

The stability of linear periodic Hamiltonian systems on time scales

Applied Mathematics Letters
2013 | Journal article
DOI:

10.1016/j.aml.2012.09.014
Contributors: Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Discrete linear Hamiltonian systems: Lyapunov type inequalities, stability and disconjugacy criteria

Journal of Mathematical Analysis and Applications
2012 | Journal article
DOI:

10.1016/j.jmaa.2012.07.009
Contributors: Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Existence of solutions for a class of nonlinear boundary value problems on half-line

2012 | Journal article
DOI:

10.1186/1687-2770-2012-43
Source: Self-asserted source
Agacik Zafer

Functional differential and difference equations with applications

Abstract and Applied Analysis
2012 | Journal article
DOI:

10.1155/2012/986585
Contributors: Braverman, E.; Diblík, J.; Györi, I.; Rogovchenko, Y.; Růžičková, M.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Nonoscillation and oscillation of second-order impulsive differential equations with periodic coefficients

2012 | Journal article
DOI:

10.1016/j.aml.2011.09.001

EID:

2-s2.0-80955149004
Contributors: Özbekler, A.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

On the oscillation of fractional differential equations

Fractional Calculus and Applied Analysis
2012 | Journal article
DOI:

10.2478/s13540-012-0016-1
Contributors: Agarwal, R.P.; Grace, S.R.; Wong, P.J.Y.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Oscillation of higher order nonlinear dynamic equations on time scales

Advances in Difference Equations
2012 | Journal article
DOI:

10.1186/1687-1847-2012-67
Contributors: Agarwal, R.P.; Grace, S.R.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎

Oscillation of nonlinear impulsive partial difference equations with continuous variables

2012 | Journal article
DOI:

10.1080/10236198.2010.548809

EID:

2-s2.0-84865812755
Contributors: Agarwal, R.P.; Karakoç, F.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

Oscillation of third-order nonlinear delay difference equations

2012 | Journal article
DOI:

10.3906/mat-1010-67

EID:

2-s2.0-84867383162
Contributors: Aktaş, M.F.; Tiryaki, A.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier

A necessary and sufficient condition for oscillation of second order sublinear delay dynamic equations

Discrete and Continuous Dynamical Systems- Series A
2011 | Journal article
EID: 2-s2.0-84875473909
Contributors: Mert, R.; Zafer, A.
Source: Self-asserted source
Agacik Zafer via Scopus - Elsevier
grade
Preferred source (of 2)‎
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Peer review (2 reviews for 2 publications/grants)

Review activity for Advances in continuous and discrete models. (1)
Review activity for Applied mathematics letters. (1)
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