All Stories

  1. Fractional-Order Chebyshev and Legendre Operators for Image Enhancement: Sharp Monotonicity, Gain Invariance and an Exact Admissibility Threshold

    Article • Fractal and Fractional, September 2026, MDPI AG

    Prof. Dr. Sibel Yalçın

  2. Parity Symmetry and Univalence of Complex Lucas, Faber and Gegenbauer Polynomial Operators for Intensity-Domain Image Enhancement

    Article • Symmetry, August 2026, MDPI AG

    Prof. Dr. Sibel Yalçın

  3. Complex Krawtchouk and Hahn Polynomial Operators for Localized and Numerically Stable Discrete Image Enhancement

    Article • Mathematics, July 2026, MDPI AG

    Prof. Dr. Sibel Yalçın

  4. A New Subclass of Analytic Functions Involving the (p,q)-Derivative and Applications to (p,q)-Poisson Distribution Series

    Article • Mathematics, June 2026, MDPI AG

    Prof. Dr. Sibel Yalçın

  5. On a Subclass of Harmonic Close-to-Convex Functions Generated by the Harmonic Error Function

    Article • Mathematical Sciences and Applications E-Notes, March 2026, Mathematical Sciences and Applications E-Notes

    Prof. Dr. Sibel Yalçın

  6. q ‐Poisson and q ‐Pascal Distribution Series for Analytic Function Classes

    Article • Journal of Mathematics, January 2026, Wiley

    Prof. Dr. Sibel Yalçın

  7. Sharp Coefficient Bounds for a Class of Analytic Functions Related to Exponential Function

    Article • Mathematics, December 2025, MDPI AG

    Prof. Dr. Sibel Yalçın

  8. Third‐Order Differential Subordination and Superordination Results for p‐Valent Analytic Function Involving Fractional Derivative Operator

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

    Prof. Dr. Sibel Yalçın

  9. Certain Subclasses of Bi-univalent Functions Associated with (u, v)-Chebyshev Polynomials

    Article • Applied Mathematics-A Journal of Chinese Universities, June 2025, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  10. On the second Hankel determinant of certain subclass of bi-univalent functions

    Article • Afrika Matematika, March 2025, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  11. Inequalities of Coefficients and the Fekete-Szegö Problem Associated with λ-Pseudo Starlike Functions

    Article • Contemporary Mathematics, December 2024, Universal Wiser Publisher Pte. Ltd

    Prof. Dr. Sibel Yalçın

  12. Some Properties and Graphical Applications of a New Subclass of Harmonic Functions Defined by a Differential Inequality

    Article • Mathematics, July 2024, MDPI AG

    Prof. Dr. Sibel Yalçın

  13. SOME BASIC PROPERTIES OF A SUBCLASS OF CLOSE-TO-CONVEX HARMONIC MAPPINGS

    Article • January 2024, Trade Unions Republican Commiittee of Azerbaijan Water Economy Workers

    Prof. Dr. Sibel Yalçın

  14. An application of generalized distribution series on certain subclasses of univalent functions

    Article • Boletín de la Sociedad Matemática Mexicana, December 2023, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  15. Bi-Univalent Functions Based on Binomial Series-Type Convolution Operator Related with Telephone Numbers

    Article • Axioms, October 2023, MDPI AG

    Prof. Dr. Sibel Yalçın, Dr Murugusundaramoorthy Gangadharan

  16. Certain Properties of Harmonic Functions Defined by a Second-Order Differential Inequality

    Article • Mathematics, September 2023, MDPI AG

    Prof. Dr. Sibel Yalçın

  17. Some Properties of Certain Multivalent Harmonic Functions

    Article • Mathematics, May 2023, MDPI AG

    Prof. Dr. Sibel Yalçın

  18. Convolution and Coefficient Estimates for (p,q)-Convex Harmonic Functions Associated with Subordination

    Article • Journal of Function Spaces, September 2022, Hindawi Publishing Corporation

    Prof. Dr. Sibel Yalçın

  19. Close-to-Convexity of q-Bessel–Wright Functions

    Article • Mathematics, September 2022, MDPI AG

    Prof. Dr. Sibel Yalçın

  20. Some basic geometric properties of a subclass of harmonic mappings

    Article • Boletín de la Sociedad Matemática Mexicana, July 2022, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  21. Initial Estimates of Seven Coefficients for a Subclass of Bi-Starlike Functions

    Article • Ukrainian Mathematical Journal, April 2022, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  22. Coefficient bounds for regular and bi-univalent functions linked with Gegenbauer polynomials

    Article • Issues of Analysis, February 2022, Petrozavodsk State University

    Prof. Dr. Sibel Yalçın

  23. New subclass of the class of close-to-convex harmonic mappings defined by a third-order differential inequality

    Article • Hacettepe Journal of Mathematics and Statistics, December 2021, Hacettepe Journal of Biology and Chemistry

    Prof. Dr. Sibel Yalçın

  24. Initial seven coefficient estimates for a subclass of bi-starlike functions

    Article • Ukrains’kyi Matematychnyi Zhurnal, November 2021, SIGMA (Symmetry, Integrability and Geometry: Methods and Application)

    Prof. Dr. Sibel Yalçın

  25. Convolutions of Harmonic Mappings Convex in the Horizontal Direction

    Article • Journal of Function Spaces, September 2021, Hindawi Publishing Corporation

    Prof. Dr. Sibel Yalçın

  26. A Proof of a Conjecture on the Convolution of Harmonic Mappings and Some Related Problems

    Article • Ukrainian Mathematical Journal, July 2021, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  27. Third Hankel determinant and Zalcman functional for a class of starlike functions with respect to symmetric points related with sine function

    Article • Journal of Mathematics and Computer Science, May 2021, International Scientific Research Publications MY SDN. BHD.

    Dr Murugusundaramoorthy Gangadharan, Prof. Dr. Sibel Yalçın

  28. Some Properties of a Generalized Integral Operator

    Article • Communications in Mathematics and Applications, March 2021, RGN Publications

    Prof. Dr. Sibel Yalçın, Nanjundan Magesh

  29. Close-to-convexity of a class of harmonic mappings defined by a third-orderdifferential inequality

    Article • TURKISH JOURNAL OF MATHEMATICS, March 2021, The Scientific and Technological Research Council of Turkey (TUBITAK-ULAKBIM) - DIGITAL COMMONS JOURNALS

    Prof. Dr. Sibel Yalçın

  30. Coefficient inequalities of analytic functions equipped with conic domains involving $q$-analogue of Noor integral operator

    Article • Tbilisi Mathematical Journal, March 2021, Tbilisi Centre for Mathematical Sciences

    Prof. Dr. Sibel Yalçın

  31. Coefficient estimates for certain subclasses of analytic functions defined by new operator

    Article • January 2021, American Institute of Physics

    Prof. Dr. Sibel Yalçın

  32. Coefficient estimates for special subclasses of k-fold symmetric bi-univalent functions

    Article • Mathematics for Applications, December 2020, Brno University of Technology

    Prof. Dr. Sibel Yalçın

  33. An Application of Subclasses of Harmonic Univalent Functions Involving Hypergeometric Function

    Article • Adıyaman University Journal of Science, December 2020, Adiyaman University

    Prof. Dr. Sibel Yalçın

  34. CERTAIN CLASSES OF BI-UNIVALENT FUNCTIONS OF COMPLEX ORDER ASSOCIATED WITH QUASI-SUBORDINATION INVOLVING (p, q) -DERIVATIVE OPERATOR

    Article • Kragujevac Journal of Mathematics, December 2020, University Library in Kragujevac

    Prof. Dr. Sibel Yalçın

  35. Uniformly starlike functions and uniformly convex functions related to the Pascal distribution

    Article • November 2020, Institute of Mathematics, Czech Academy of Sciences

    Prof. Dr. Sibel Yalçın, Dr Murugusundaramoorthy Gangadharan

  36. A New Class of Salagean-Type Multivalent Harmonic Functions Defined by Subordination

    Article • Iranian Journal of Science and Technology Transactions A Science, October 2020, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  37. Coefficient Estimates for Certain Subclasses of Analytic Functions Defined by New Differential Operator

    Article • Celal Bayar Üniversitesi Fen Bilimleri Dergisi, September 2020, Celal Bayar University Journal of Science

    Prof. Dr. Sibel Yalçın

  38. Hankel Inequalities for a Subclass of Bi-Univalent Functions based on Salagean type q-Difference Operator

    Article • Journal of Mathematical and Fundamental Sciences, September 2020, The Institute for Research and Community Services (LPPM) ITB

    Prof. Dr. Sibel Yalçın, Dr Murugusundaramoorthy Gangadharan

  39. Univalency and Convolution Results Associated to Starlike Functions with Respect to Symmetric Points

    Article • July 2020, Prof. Marin Drinov Academic Publishing House

    Prof. Dr. Sibel Yalçın

  40. Applications of Horadam polynomials to general classes of bi-univalent functions involving the q-derivative operator

    Article • Mathematica, May 2020, Babes-Bolyai University

    Prof. Dr. Sibel Yalçın

  41. A subclass with bi-univalence involving ($${\mathfrak {p}}$$,$${\mathfrak {q}}$$)- Lucas polynomials and its coefficient bounds

    Article • Boletín de la Sociedad Matemática Mexicana, May 2020, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  42. New Criteria for Meromorphic Starlikeness and Close-to-Convexity

    Article • Mathematics, May 2020, MDPI AG

    Prof. Dr. Sibel Yalçın

  43. A Class of Harmonic Starlike Functions defined by Multiplier Transformation

    Article • Advances in Mathematics Scientific Journal, May 2020, Union of Researchers of Macedonia

    Prof. Dr. Sibel Yalçın

  44. A NEW SUBCLASS OF STARLIKE HARMONIC FUNCTIONS DEFINED BY SUBORDINATION

    Article • Al-Qadisiyah Journal Of Pure Science, March 2020, Al-Qadisiyah Journal of Pure Science

    Prof. Dr. Sibel Yalçın

  45. Some applications of the (p,q)-Lucas polynomials to the bi-univalent function class $\Sigma $

    Article • Mathematical Sciences and Applications E-Notes, February 2020, Mathematical Sciences and Applications E-Notes

    Prof. Dr. Sibel Yalçın

  46. Horadam polynomials and their applications tonew family of bi-univalent functions with respect to symmetric conjugate points

    Article • Proyecciones (Antofagasta), February 2020, Universidad Catolica del Norte - Chile

    Prof. Dr. Sibel Yalçın

  47. Subclass of analytic functions associated with Pascal distribution series

    Article • Bulletin of the Transilvania University of Brasov Series III Mathematics and Computer Science, January 2020, Universitatea Transilvania Brasov

    Prof. Dr. Sibel Yalçın, Dr Murugusundaramoorthy Gangadharan

  48. On a New Class of Analytic Functions Related to Fractional Calculus

    Article • January 2020, Prof. Marin Drinov Academic Publishing House

    Prof. Dr. Sibel Yalçın

  49. Coefficients assessment for certain subclasses of bi-univalent functions related with quasi-subordination

    Article • Publications de l Institut Mathematique, January 2020, National Library of Serbia

    Prof. Dr. Sibel Yalçın

  50. Some applications of generalized Srivastava-Attiya operator to the bi-concave functions

    Article • Miskolc Mathematical Notes, January 2020, Mathematical Notes

    Prof. Dr. Sibel Yalçın

  51. New differential subordinations obtained by using a differential-integral Ruscheweyh-Libera operator

    Article • Miskolc Mathematical Notes, January 2020, Mathematical Notes

    Prof. Dr. Sibel Yalçın

  52. Complex Analysis

    Article • Mathematica Slovaca, December 2019, De Gruyter

    Prof. Dr. Sibel Yalçın, Ali Ebadian, Vali Soltani Masih

  53. (p, q)-Lucas polynomials and their applications to bi-univalent functions

    Article • Proyecciones (Antofagasta), December 2019, Universidad Catolica del Norte - Chile

    Prof. Dr. Sibel Yalçın

  54. Some connections between various classes of analytic functions associated with the power series distribution

    Article • Sakarya University Journal of Science, October 2019, Sakarya University Journal of Science

    Prof. Dr. Sibel Yalçın

  55. Notes on certain analytic functions concerning some subordinations

    Article • Acta et Commentationes Universitatis Tartuensis de Mathematica, August 2019, University of Tartu Press

    Prof. Dr. Sibel Yalçın

  56. Initial coefficient estimates for a new subclasses of analytic and $m$-fold symmetric bi-univalent functions

    Article • Malaya Journal of Matematik, July 2019, Malaya Journal of Matematik

    Prof. Dr. Sibel Yalçın

  57. The (p, q)-Chebyshev polynomial bounds of a general bi-univalent function class

    Article • Boletín de la Sociedad Matemática Mexicana, June 2019, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  58. Fekete–Szegö inequalities for subclass of bi-univalent functions associated with Sălăgean type q-difference operator

    Article • Afrika Matematika, May 2019, Springer Science + Business Media

    Dr Murugusundaramoorthy Gangadharan, Prof. Dr. Sibel Yalçın

  59. Subclass of k-Uniformly Starlike Functions Defined by the Symmetric q-Derivative Operator

    Article • Ukrainian Mathematical Journal, April 2019, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  60. Abstract P4-03-07: Analysis of hereditary cancer syndromes by using a panel of genes: Novel and multiple pathogenic mutations

    Article • Cancer Research, February 2019, American Association for Cancer Research (AACR)

    Prof. Dr. Sibel Yalçın

  61. A Subclass of Bi-Univalent Functions Based on the Faber Polynomial Expansions and the Fibonacci Numbers

    Article • Mathematics, February 2019, MDPI AG

    Prof. Dr. Sibel Yalçın

  62. Chebyshev polynomial bounds for a certain subclass of univalent functions defined by Komatu integral operator

    Article • Afrika Matematika, February 2019, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  63. Univalent harmonic mappings and Hardy spaces

    Article • TURKISH JOURNAL OF MATHEMATICS, January 2019, The Scientific and Technological Research Council of Turkey (TUBITAK-ULAKBIM) - DIGITAL COMMONS JOURNALS

    Prof. Dr. Sibel Yalçın

  64. On T-neighbourhoods of Harmonic Univalent Functions

    Article • Iranian Journal of Science and Technology Transactions A Science, January 2019, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  65. Subclasses of harmonic univalent functions associated with generalized Ruscheweyh operator

    Article • Publications de l Institut Mathematique, January 2019, National Library of Serbia

    Prof. Dr. Sibel Yalçın

  66. Construction of the second Hankel determinant for a new subclass of bi-univalentfunctions

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

    Prof. Dr. Sibel Yalçın

  67. On the Chebyshev coefficients for a general subclass of univalent functions

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

    Prof. Dr. Sibel Yalçın

  68. Certain Subclasses of Bi-Univalent Functions Associated with the Horadam Polynomials

    Article • Iranian Journal of Science and Technology Transactions A Science, November 2018, Springer Science + Business Media

    Prof. Dr. Hari Mohan Srivastava, Prof. Dr. Sibel Yalçın

  69. On the (p, q)-Lucas polynomial coefficient bounds of the bi-univalent function class $$\sigma $$ σ

    Article • Boletín de la Sociedad Matemática Mexicana, July 2018, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  70. Poisson Distribution Series for Analytic Univalent Functions

    Article • Complex Analysis and Operator Theory, January 2018, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  71. On a subclass of harmonic univalent functions involving a linear operator

    Article • January 2018, American Institute of Physics

    Prof. Dr. Sibel Yalçın

  72. Coefficient Bounds of Bi-univalent Functions Using Faber Polynomial

    Article • January 2018, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  73. Hankel determinant for a subclass of bi-univalent functions defined by using a symmetric q-derivative operator

    Article • Filomat, January 2018, National Library of Serbia

    Prof. Dr. Sibel Yalçın

  74. On some subclasses of m-fold symmetric bi-univalent functions

    Article • Communications Faculty of Sciences University of Ankara Series A1 Mathematics and Statistics, January 2018, Communications Faculty of Sciences University of Ankara Series A1 Mathematics and Statistics

    Prof. Dr. Sibel Yalçın

  75. Faber polynomial coefficient estimates for certain classes of bi-univalent functions defined by using the Jackson (p,q)-derivative operator

    Article • The Journal of Nonlinear Sciences and Applications, June 2017, International Scientific Research Publications MY SDN. BHD.

    Prof. Dr. Sibel Yalçın

  76. Faber polynomial coefficient estimates for bi-univalent functions of complex order based on subordinate conditions involving of the Jackson $(p,q)$-derivative

    Article • Miskolc Mathematical Notes, January 2017, Mathematical Notes

    Prof. Dr. Sibel Yalçın

  77. On the faber polynomial coefficient bounds of bi-Bazilevic functions

    Article • Communications Faculty of Sciences University of Ankara Series A1 Mathematics and Statistics, January 2017, Communications Faculty of Sciences University of Ankara Series A1 Mathematics and Statistics

    Prof. Dr. Sibel Yalçın

  78. Upper Bound of Second Hankel Determinant for Bi-Bazilevic̆ Functions

    Article • Mediterranean Journal of Mathematics, May 2016, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  79. Coefficient problem for certain subclasses of bi-univalent functions defined by convolution

    Article • Mathematica Moravica, January 2016, Centre for Evaluation in Education and Science (CEON/CEES)

    Prof. Dr. Sibel Yalçın

  80. Faber polynomial coefficient bounds for a subclass of bi-univalent functions

    Article • Comptes Rendus Mathématique, October 2015, Cellule MathDoc/CEDRAM

    Prof. Dr. Sibel Yalçın

  81. On a new subclass of bi-univalent functions satisfying subordinate conditions

    Article • Acta Universitatis Sapientiae Mathematica, January 2015, De Gruyter

    Prof. Dr. Sibel Yalçın

  82. Coefficient Bounds for Certain Subclasses ofm-Fold Symmetric Biunivalent Functions

    Article • Journal of Mathematics, January 2015, Hindawi Publishing Corporation

    Prof. Dr. Sibel Yalçın

  83. Coefficient Estimates for Two New Subclasses of Biunivalent Functions with respect to Symmetric Points

    Article • Journal of Function Spaces, January 2015, Hindawi Publishing Corporation

    Prof. Dr. Sibel Yalçın

  84. Neighbourhoods of two new classes of harmonic univalent functions with varying arguments

    Article • Mathematica Slovaca, December 2014, De Gruyter

    Prof. Dr. Sibel Yalçın

  85. Fekete-Szegö Inequalities for Certain Classes of Biunivalent Functions

    Article • International Scholarly Research Notices, November 2014, Hindawi Publishing Corporation

    Prof. Dr. Sibel Yalçın

  86. Initial Coefficient Bounds for a General Class of Biunivalent Functions

    Article • International Journal of Analysis, April 2014, Hindawi Publishing Corporation

    Prof. Dr. Sibel Yalçın

  87. Certain Properties Of A Subclass Of Harmonic Functions

    Article • Applied Mathematics & Information Sciences, September 2013, Natural Sciences Publishing

    Prof. Dr. Sibel Yalçın

  88. Partial sums of starlike harmonic multivalent functions

    Article • Afrika Matematika, July 2013, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın

  89. On a new subclass of Ruscheweyh-type harmonic multivalent functions

    Article • Journal of Inequalities and Applications, May 2013, Springer Science + Business Media

    Prof. Dr. Hari Mohan Srivastava, Prof. Dr. Sibel Yalçın

  90. Properties of a Class of -Harmonic Functions

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

    Prof. Dr. Sibel Yalçın

  91. Neighborhoods of a new class of harmonic multivalent functions

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

    Prof. Dr. Sibel Yalçın

  92. On meromorphically harmonic starlike functions with respect to symmetric conjugate points

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

    Prof. Dr. Sibel Yalçın

  93. ON A SUBCLASS OF CERTAIN CONVEX HARMONIC FUNCTIONS

    Article • Journal of the Korean Mathematical Society, July 2006, The Korean Mathematical Society

    Prof. Dr. Sibel Yalçın

  94. A new class of Salagean-type harmonic univalent functions

    Article • Applied Mathematics Letters, February 2005, Elsevier

    Prof. Dr. Sibel Yalçın

  95. Convex subclass of harmonic starlike functions

    Article • Applied Mathematics and Computation, July 2004, Elsevier

    Prof. Dr. Sibel Yalçın

  96. A new subclass of complex harmonic functions

    Article • Mathematical Inequalities & Applications, January 2004, Element d.o.o.

    Prof. Dr. Sibel Yalçın

  97. A subclass of harmonic univalent functions with negative coefficients

    Article • Applied Mathematics and Computation, October 2003, Elsevier

    Prof. Dr. Sibel Yalçın

  98. On Some Subclasses of Harmonic Functions

    Article • January 2000, Springer Science + Business Media

    Prof. Dr. Sibel Yalçın