All Stories

  1. Equivalence Transformation for Neutral Differential Equations: Oscillation of Solutions

    Article • Mathematics, July 2025, MDPI AG

    Prof. Agacik Zafer

  2. Oscillation of Second‐Order Canonical and Noncanonical Delay Differential Equations

    Article • Mathematical Methods in the Applied Sciences, April 2025, Wiley

    Prof. Agacik Zafer

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

    Article • Mathematical Methods in the Applied Sciences, November 2024, Wiley

    Prof. Agacik Zafer

  4. Wong type oscillation criteria for nonlinear impulsive differential equations

    Article • Mathematical Methods in the Applied Sciences, October 2022, Wiley

    Prof. Agacik Zafer

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

    Article • Journal of Mathematical Analysis and Applications, August 2022, Elsevier

    Prof. Agacik Zafer

  6. Wong Type Oscillation Criteria for Nonlinear Impulsive Differential Equations

    Article • April 2022, Authorea, Inc.

    Prof. Agacik Zafer

  7. Leighton and Wong type oscillation theorems for impulsive differential equations

    Article • Applied Mathematics Letters, November 2021, Elsevier

    Prof. Agacik Zafer

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

    Article • Mediterranean Journal of Mathematics, June 2020, Springer Science + Business Media

    Prof. Agacik Zafer

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

    Article • Hacettepe Journal of Mathematics and Statistics, April 2020, Hacettepe Journal of Biology and Chemistry

    Prof. Agacik Zafer

  10. On oscillation of third-order noncanonical delay differential equations

    Article • Applied Mathematics and Computation, December 2019, Elsevier

    Prof. Agacik Zafer

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

    Article • Applied Mathematics Letters, April 2019, Elsevier

    Prof. Agacik Zafer

  12. Asymptotic representation of solutions for second-order impulsive differential equations

    Article • Applied Mathematics and Computation, September 2018, Elsevier

    Prof. Agacik Zafer

  13. Boundary value problems on half-line for second-order nonlinear impulsive differential equations

    Article • Mathematical Methods in the Applied Sciences, May 2018, Wiley

    Prof. Agacik Zafer

  14. Asymptotic integration of second-order impulsive differential equations

    Article • Applied Mathematics Letters, February 2018, Elsevier

    Prof. Agacik Zafer

  15. On oscillation of integro-differential equations

    Article • TURKISH JOURNAL OF MATHEMATICS, January 2018, The Scientific and Technological Research Council of Turkey (TUBITAK-ULAKBIM) - DIGITAL COMMONS JOURNALS

    Prof. Agacik Zafer

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

    Article • The European Physical Journal Special Topics, December 2017, Springer Science + Business Media

    Prof. Agacik Zafer

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

    Article • Mathematical Methods in the Applied Sciences, March 2017, Wiley

    Prof. Agacik Zafer

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

    Article • Journal of Mathematical Sciences, March 2017, Springer Science + Business Media

    Prof. Agacik Zafer

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

    Article • Asymptotic Analysis, February 2017, IOS Press

    Ravi Agarwal, Prof. Agacik Zafer

  20. A fixed point approach to singular impulsive boundary value problems

    Article • January 2017, American Institute of Physics

    Prof. Agacik Zafer

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

    Article • Journal of Mathematical Analysis and Applications, August 2016, Elsevier

    Prof. Agacik Zafer

  22. Oscillation criteria for a certain class of fractional order integro-diferential equations

    Article • Hacettepe Journal of Mathematics and Statistics, January 2016, Hacettepe Journal of Biology and Chemistry

    Prof. Agacik Zafer

  23. Lyapunov-type inequalities for nonlinear impulsive systems with applications

    Article • Electronic journal of qualitative theory of differential equations, January 2016, University of Szeged

    Prof. Agacik Zafer

  24. Asymptotic integration of second-order nonlinear delay differential equations

    Article • Applied Mathematics Letters, October 2015, Elsevier

    Prof. Agacik Zafer

  25. Oscillation criteria for n th-order nonlinear delay differential equations with a middle term

    Article • Mathematical Methods in the Applied Sciences, July 2015, Wiley

    Prof. Agacik Zafer

  26. Recent Trends in Boundary Value Problems 2014

    Article • Abstract and Applied Analysis, January 2015, Hindawi Publishing Corporation

    Prof. Agacik Zafer

  27. Stability criteria for linear Hamiltonian systems under impulsive perturbations

    Article • Applied Mathematics and Computation, March 2014, Elsevier

    Prof. Agacik Zafer

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

    Article • Journal of Computational and Applied Mathematics, March 2014, Elsevier

    Prof. Agacik Zafer

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

    Article • Applied Mathematics Letters, February 2014, Elsevier

    Prof. Agacik Zafer

  30. Functional Differential and Difference Equations with Applications 2013

    Article • Abstract and Applied Analysis, January 2014, Hindawi Publishing Corporation

    Prof. Agacik Zafer

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

    Article • Applied Mathematics Letters, September 2013, Elsevier

    Prof. Agacik Zafer

  32. Oscillation of integro-dynamic equations on time scales

    Article • Applied Mathematics Letters, April 2013, Elsevier

    Prof. Agacik Zafer

  33. Oscillation of even order nonlinear delay dynamic equations on time scales

    Article • Czechoslovak Mathematical Journal, March 2013, Institute of Mathematics, Czech Academy of Sciences

    Prof. Agacik Zafer

  34. The stability of linear periodic Hamiltonian systems on time scales

    Article • Applied Mathematics Letters, March 2013, Elsevier

    Prof. Agacik Zafer

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

    Article • Applied Mathematics and Computation, February 2013, Elsevier

    Prof. Agacik Zafer

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

    Article • January 2013, Springer Science + Business Media

    Prof. Agacik Zafer

  37. Impulsive Boundary Value Problems for Planar Hamiltonian Systems

    Article • Abstract and Applied Analysis, January 2013, Hindawi Publishing Corporation

    Prof. Agacik Zafer

  38. Lyapunov-type inequalities for planar linear dynamic Hamiltonian systems

    Article • Applicable Analysis and Discrete Mathematics, January 2013, National Library of Serbia

    Prof. Agacik Zafer

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

    Article • Mathematical Inequalities & Applications, January 2013, Element d.o.o.

    Prof. Agacik Zafer

  40. Recent Trends in Boundary Value Problems

    Article • Abstract and Applied Analysis, January 2013, Hindawi Publishing Corporation

    Prof. Agacik Zafer

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

    Article • Journal of Mathematical Analysis and Applications, December 2012, Elsevier

    Prof. Agacik Zafer

  42. Oscillation of nonlinear impulsive partial difference equations with continuous variables

    Article • The Journal of Difference Equations and Applications, June 2012, Taylor & Francis

    Prof. Agacik Zafer

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

    Article • Complex Variables and Elliptic Equations, May 2012, Taylor & Francis

    Prof. Agacik Zafer

  44. Oscillation of higher order nonlinear dynamic equations on time scales

    Article • Advances in Difference Equations, May 2012, Springer Science + Business Media

    Prof. Agacik Zafer

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

    Article • Boundary Value Problems, April 2012, Springer Science + Business Media

    Prof. Agacik Zafer

  46. On the oscillation of fractional differential equations

    Article • Fractional Calculus and Applied Analysis, March 2012, Springer Science + Business Media

    Prof. Agacik Zafer

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

    Article • Applied Mathematics Letters, March 2012, Elsevier

    Prof. Agacik Zafer

  48. Functional Differential and Difference Equations with Applications

    Article • Abstract and Applied Analysis, January 2012, Hindawi Publishing Corporation

    Prof. Agacik Zafer

  49. Oscillation of third-order nonlinear delay difference equations

    Article • TURKISH JOURNAL OF MATHEMATICS, January 2012, The Scientific and Technological Research Council of Turkey (TUBITAK-ULAKBIM) - DIGITAL COMMONS JOURNALS

    Prof. Agacik Zafer

  50. On disconjugacy and stability criteria for discrete Hamiltonian systems

    Article • Computers & Mathematics with Applications, October 2011, Elsevier

    Prof. Agacik Zafer

  51. Forced oscillation of second-order nonlinear differential equations with positive and negative coefficients

    Article • Applied Mathematics Letters, July 2011, Elsevier

    Prof. Agacik Zafer

  52. Annulus criteria for mixed nonlinear elliptic differential equations

    Article • Mathematical and Computer Modelling, May 2011, Elsevier

    Prof. Agacik Zafer

  53. Time scale extensions of a theorem of Wintner on systems with asymptotic equilibrium

    Article • The Journal of Difference Equations and Applications, May 2011, Taylor & Francis

    Prof. Agacik Zafer

  54. Oscillation of solutions of second order mixed nonlinear differential equations under impulsive perturbations

    Article • Computers & Mathematics with Applications, February 2011, Elsevier

    Prof. Agacik Zafer

  55. Existence and Asymptotic Behavior of Positive Solutions of Functional Differential Equations of Delayed Type

    Article • Abstract and Applied Analysis, January 2011, Hindawi Publishing Corporation

    Prof. Agacik Zafer

  56. On Stability of Linear Delay Differential Equations under Perron's Condition

    Article • Abstract and Applied Analysis, January 2011, Hindawi Publishing Corporation

    Prof. Agacik Zafer

  57. Oscillation of Second-Order Sublinear Impulsive Differential Equations

    Article • Abstract and Applied Analysis, January 2011, Hindawi Publishing Corporation

    Prof. Agacik Zafer

  58. Interval criteria for second-order super-half-linear functional dynamic equations with delay and advance arguments

    Article • The Journal of Difference Equations and Applications, August 2010, Taylor & Francis

    Prof. Agacik Zafer

  59. Oscillation criteria for third-order nonlinear functional differential equations

    Article • Applied Mathematics Letters, July 2010, Elsevier

    Prof. Agacik Zafer

  60. Principal and nonprincipal solutions of impulsive differential equations with applications

    Article • Applied Mathematics and Computation, April 2010, Elsevier

    Prof. Agacik Zafer

  61. A Survey on Oscillation of Impulsive Ordinary Differential Equations

    Article • Advances in Difference Equations, January 2010, Springer Science + Business Media

    Prof. Agacik Zafer

  62. Interval oscillation criteria for second-order forced delay dynamic equations with mixed nonlinearities

    Article • Computers & Mathematics with Applications, January 2010, Elsevier

    Prof. Agacik Zafer

  63. Oscillation of Second-Order Mixed-Nonlinear Delay Dynamic Equations

    Article • Advances in Difference Equations, January 2010, Springer Science + Business Media

    Prof. Agacik Zafer

  64. Recent Trends in Differential and Difference Equations

    Article • Advances in Difference Equations, January 2010, Springer Science + Business Media

    Prof. Agacik Zafer

  65. Integral criteria for oscillation of third order nonlinear differential equations

    Article • Nonlinear Analysis, December 2009, Elsevier

    Prof. Agacik Zafer

  66. Nonlinear oscillation of second-order dynamic equations on time scales

    Article • Applied Mathematics Letters, October 2009, Elsevier

    Prof. Agacik Zafer

  67. Interval oscillation criteria for second order super‐half linear functional differential equations with delay and advanced arguments

    Article • Mathematische Nachrichten, September 2009, Wiley

    Prof. Agacik Zafer

  68. Interval criteria for the forced oscillation of super-half-linear differential equations under impulse effects

    Article • Mathematical and Computer Modelling, July 2009, Elsevier

    Prof. Agacik Zafer

  69. On oscillation and nonoscillation of second-order dynamic equations

    Article • Applied Mathematics Letters, January 2009, Elsevier

    Prof. Agacik Zafer

  70. Oscillation Criteria for Second-Order Forced Dynamic Equations with Mixed Nonlinearities

    Article • Advances in Difference Equations, January 2009, Springer Science + Business Media

    Prof. Agacik Zafer

  71. Stability criterion for second order linear impulsive differential equations with periodic coefficients

    Article • Mathematische Nachrichten, August 2008, Wiley

    Prof. Agacik Zafer

  72. Calculating the matrix exponential of a constant matrix on time scales

    Article • Applied Mathematics Letters, June 2008, Elsevier

    Prof. Agacik Zafer

  73. Stability criteria for linear periodic impulsive Hamiltonian systems

    Article • Journal of Mathematical Analysis and Applications, November 2007, Elsevier

    Prof. Agacik Zafer

  74. Asymptotic equivalence of differential equations and asymptotically almost periodic solutions

    Article • Nonlinear Analysis, September 2007, Elsevier

    Prof. Agacik Zafer

  75. Forced oscillation of super-half-linear impulsive differential equations

    Article • Computers & Mathematics with Applications, September 2007, Elsevier

    Prof. Agacik Zafer

  76. Oscillation of Higher-Order Neutral-Type Periodic Differential Equations with Distributed Arguments

    Article • Journal of Inequalities and Applications, January 2007, Springer Science + Business Media

    Prof. Agacik Zafer

  77. Perron's theorem for linear impulsive differential equations with distributed delay

    Article • Journal of Computational and Applied Mathematics, August 2006, Elsevier

    Prof. Agacik Zafer, Jehad Alzabut

  78. Picone's formula for linear non-selfadjoint impulsive differential equations

    Article • Journal of Mathematical Analysis and Applications, July 2006, Elsevier

    Prof. Agacik Zafer

  79. The exponential of a constant matrix on time scales

    Article • The ANZIAM Journal, July 2006, Cambridge University Press

    Prof. Agacik Zafer

  80. Second-order oscillation of forced functional differential equations with oscillatory potentials

    Article • Computers & Mathematics with Applications, May 2006, Elsevier

    Prof. Agacik Zafer

  81. Sturmian comparison theory for linear and half-linear impulsive differential equations

    Article • Nonlinear Analysis, November 2005, Elsevier

    Prof. Agacik Zafer

  82. Interval oscillation of a general class of second-order nonlinear differential equations with nonlinear damping

    Article • Nonlinear Analysis, January 2005, Elsevier

    Prof. Agacik Zafer

  83. Controllability of two-point nonlinear boundary-value problems by the numerical-analytic method

    Article • Applied Mathematics and Computation, April 2004, Elsevier

    Prof. Agacik Zafer

  84. The control of boundary value problems for quasilinear impulsive integro-differential equations

    Article • Nonlinear Analysis, January 2002, Elsevier

    Prof. Agacik Zafer

  85. Oscillatory and asymptotic behavior of higher order difference equations

    Article • Mathematical and Computer Modelling, February 1995, Elsevier

    Prof. Agacik Zafer

  86. Oscillation of a neutral difference equation

    Article • Applied Mathematics Letters, March 1993, Elsevier

    Prof. Agacik Zafer

  87. Oscillation of bounded solutions of neutral differential equations

    Article • Applied Mathematics Letters, March 1993, Elsevier

    Prof. Agacik Zafer