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Articles

CJPLS: VOL. 14, NO. 1, JUNE 2026

Bi-Univalency of a Generalised Distribution Series Convoluted with Beta Function and Poisson Distribution Series via Bells Number

Submitted
December 16, 2025
Published
2026-04-09

Abstract

In this study, the number of equivalence relations on a set of n elements is given by the n-th Bell number (Bn). These numbers represent all possible partitions of a set. By using Beta and Poisson distribution series we applied convolution principle in order to investigate coefficient estimates. The researchers focused on the relationship between Bell numbers and the bi-univalency of a generalized distribution series that combines the Poisson distribution series and the Beta function. To achieve the results, the initial bounds on coefficients for the specified classes of functions will be employed to derive the well-known Fekete-Szegö inequalities. These findings signify a fresh contribution to the realm of Geometric Function Theory (GFT) as there has been no existing literature that discusses the convolution involving both the Beta function and the Poisson distribution series.

References

  1. Anwar, M., and Ahmad, M. (2014). On some properties of geometric Poisson distribution. Pak. J. Statist., 30(2), 233–244.
  2. Babalola, K. O. (2013). On -pseudo-starlike function. J. Class. Anal., 3, 137–147.
  3. Duren, P. L. (1983). Univalent functions. A series of comprehensive studies in Mathematics, Vol. 259. Springer-Verlag, New York.
  4. Fadipe-Joseph, O. A., Windare, O. J., Adeniran, N. A., & Olatunji, S. O. (2021). Remodelled sigmoid function in the space of univalent functions. Bulletin of the International Mathematical Virtual Institute, 11(2), 387–394.
  5. Frasin, B. A., and Gharaibeh, M. M. (2020). Subclass of analytic functions associated with Poisson distribution series. Afrika Matematika, 31(7), 1167–1173.
  6. Frasin, B. A., and Aouf, M. K. (2011). New subclasses of bi-univalent functions. Applied Mathematics Letters, 24(9), 1569–1573.
  7. Gbolagade, A. M., and Awolere, I. T. (2024). Generalized distribution for bi-univalent functions defined by error and Poisson distribution via Bell number. COAST Journal of the School of Science, 6(2), 1120–1128. https://doi.org/10.61281/coastjss.v6i2.12
  8. Jahangiri, J. M., Ramachandran, C., and Annamalai, S. (2018). Fekete–Szegö problem for certain analytic functions defined by hypergeometric functions and Jacobi polynomial. J. Fract. Calc. Appl., 9, 1–7.
  9. Kumar, V., Cho, N. E., Ravichandran, V., and Srivastava, H. M. (2019). Sharp coefficient bounds for starlike functions associated with the Bell numbers. Math. Slovaca, 69, 1053–1064.
  10. Lewin, M. (1967). On a coefficient problem for bi-univalent functions. Proceedings of the American Mathematical Society.
  11. Oluwayemi, M. O., Olatunji, S. O., and Ogunlade, T. O. (2022). On a Certain Subclass of Univalent Functions Involving the Beta Function. International Journal of Mathematics and Computer Science, 17(4), 1715–1719. ISSN: 1814-0432. Available at: http://ijmcs.future-in-tech.net
  12. Murugunsundaramoorthy, G., Olatunji, S. O., and Fadipe-Joseph, O. A. (2018). Fekete–Szegö problems for analytic functions in the space of logistic sigmoid functions based on quasi-subordination. Int. J. Nonlinear Anal. Appl., 9(1), 55–68.
  13. Murugusundaramoorthy, G., and Viyaja, K. (2016). Some inclusion results of certain subclasses of analytic functions associated with Poisson distribution series. Hacettepe Journal of Mathematics and Statistics, 45(4), 1101–1107.
  14. Murusundamorthy, M., and Yamini, G. (2015). On a subclass of bi-univalent functions involving Chebyshev polynomials. Mathematical Sciences International Research Journal, 4, 88–92.
  15. Netanyahu, E. (1969). The minimal radius of univalence of for functions univalent in . Mathematika, 16, 5–11.
  16. Oladipo, A. A. (2020). Geometric interpretation of generalised probability distributions in function spaces.
  17. Oladipo, A. A., and Opoola, T. O. (2010). On certain analytic functions defined by a generalized distribution.
  18. Oladipo, O. A., and Opoola, T. O. (2010). On certain subclasses of analytic functions defined by a generalized distribution series. Journal of Inequalities and Applications, vol. 2010, Article ID 706781, 12 pages.
  19. Oladipo, O. A. (2016). New subclasses of analytic functions defined by generalized distribution series. Annals of Functional Analysis, 7(3), 421–431.
  20. Oladipo, O. A. (2019). Applications of generalized distribution series to geometric function theory. International Journal of Mathematics and Mathematical Sciences, vol. 2019, Article ID 2041752, 8 pages.
  21. Oladipo, O. A. (2020). On the coefficient estimates of a subclass of analytic functions defined by a generalized distribution series. Palestine Journal of Mathematics, 9(2), 217–226.
  22. Olatunji, S. O., and Oladipo, A. T. (2011). On a new subfamily of analytic and univalent functions with negative coefficients with respect to other points. Bull. Math. Anal. Appl., 3(2), 159–166.
  23. Olatunji, S. O., Oluwayemi, M. O., Porwal, S., and Alb Lupas, A. (2024).On Quasi-Subordination for Bi-Univalency Involving Generalized Distribution Series. Symmetry, 16(6), 773. https://doi.org/10.3390/sym16060773
  24. Olatunji, S. O., Sakar, F. M., Breaz, N., Aydogan, S. M., and Oluwayemi, M. O. (2024). Bi-Univalency of -Fold Symmetric Functions Associated with a Generalized Distribution.Mathematics, 12(1), 169. https://doi.org/10.3390/math12020169
  25. Oluweyemi, M. O., Olatunji, S. O., and Ogunlade, T. O. (2022). On certain properties of a univalent function associated with beta function. Abstract and Applied Analysis, vol. 2022, Article ID 8150057, 6 pages. https://doi.org/10.1155/2022/8150057.
  26. Porwal, S. (2013). On certain classes of analytic functions associated with a distribution series. Journal of the Egyptian Mathematical Society, 21(3), 246–251. Porwal, S. (2018). Generalized distribution and its geometric properties associated with univalent functions. Journal of Complex Analysis, 2018, 1–5.
  27. Porwal, S. (2014). New subclasses of analytic functions using a generalized distribution series. Bulletin of the Malaysian Mathematical Society, 37(1), 85–96.
  28. Porwal, S. and Kumar, M. (2016). A unified study on starlike and convex functions associated with Poisson distribution series, Afr. Mat., 27(5), 1021-1027.
  29. Porwal, R. K. (2018). A note on generalized distribution series and its applications in analytic function theory.
  30. Srivastava, H. M., Mishra, A. K., and Gochhayat, P. (2010). Certain subclasses of analytic and bi-univalent functions. Applied Mathematics Letters, 23(10), 1188–1192.
  31. Stanley, R. P. (2011). Enumerative Combinatorics, Vol. 1 (2nd ed.). Cambridge University Press.
  32. Ma, W. and Minda, D. (1994). A unified treatment of some classes of univalent functions, 157 169.
  33. Murugusundaramoorthy, G. (2017). Subclasses of starlike and convex functions involving Poisson distribution series. Afr. Mat., 28, 1357 – 1366.
  34. Abo Elyazyd, G. E., Agarwal, P., Elmahdy, A. I., Darwish, H. E. and Jain, S. (2026). Bi-Unvalent functions classes defined by Poisson distribution series. Kragujevac Journal of Mathematics. 50 (9), 1497 – 1510.
  35. Brannan, D. A. and Taha, T. S. (1985) On some classes of bi-univalent functions in S. M. Mazbar, A Hamoni and N. S. Faour (Eds). Mathematical Analysis and its Applications. Kuwait, 18 – 21. KFAS Proceedings Series 3, Pergamon Press, Elsevier Science Limited, Oxford, 1988, 53 – 60.