Log in

Initial estimates for certain subclasses of bi-univalent functions with \(\kappa \)-Fibonacci numbers

  • Published:
Afrika Matematika Aims and scope Submit manuscript

Abstract

In this work, we consider certain class of bi-univalent functions related with shell-like curves related to \(\kappa \)-Fibonacci numbers. Further, we obtain the estimates of initial Taylor–Maclaurin coefficients (second and third coefficients) and Fekete–Szegö inequalities. Also we discuss the special cases of the obtained results.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Subscribe and save

Springer+ Basic
EUR 32.99 /Month
  • Get 10 units per month
  • Download Article/Chapter or Ebook
  • 1 Unit = 1 Article or 1 Chapter
  • Cancel anytime
Subscribe now

Buy Now

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

Availability of data and material

No data were used to support this study.

References

  1. Abirami, C., Magesh, N., Gatti, N.B., Yamini, J.: Horadam polynomial coefficient estimates for a class of \(\lambda -\)bi-pseudo-starlike functions. J. Anal. (2020). https://doi.org/10.1007/s41478-020-00224-2

    Article  MATH  Google Scholar 

  2. Ali, R.M., Lee, S.K., Ravichandran, V., Supramanian, S.: Coefficient estimates for bi-univalent Ma-Minda starlike and convex functions. Appl. Math. Lett. 25(3), 344–351 (2012)

    Article  MathSciNet  MATH  Google Scholar 

  3. Altınkaya, Ş, Yalçin, S.: On the (p, q)-Lucas polynomial coefficient bounds of the bi-univalent function class . Bol. Soc. Mat. Mex. (3) 25(3), 567–575 (2019)

  4. Altınkaya, Ş, Yalçin, S., Çakmak, S.: A subclass of bi-Univalent functions based on the Faber polynomial expansions and the Fibonacci numbers. Mathematics 160(7), 1–9 (2019)

    Google Scholar 

  5. Altınkaya, Ş., Hamidi, S. G., Jahangiri, Jay M., Yalçin, S.: Inclusion properties for bi-univalent functions of complex order defined by combining of Faber polynomial expansions and Fibonacci numbers. ar**v:1901.07367

  6. Bulut, S.: Coefficient estimates for a class of analytic and bi-univalent functions. Novi Sad J. Math. 43(2), 59–65 (2013)

    MathSciNet  MATH  Google Scholar 

  7. Çağlar, M., Orhan, H., Yağmur, N.: Coefficient bounds for new subclasses of bi-univalent functions. Filomat 27(7), 1165–1171 (2013)

    Article  MathSciNet  MATH  Google Scholar 

  8. Deniz, E.: Certain subclasses of bi-univalent functions satisfying subordinate conditions. J. Class. Anal. 2(1), 49–60 (2013)

    Article  MathSciNet  MATH  Google Scholar 

  9. Dziok, J., Raina, R.K., Sokół, J.: Certain results for a class of convex functions related to a shell-like curve connected with Fibonacci numbers. Comput. Math. Appl. 61(9), 2605–2613 (2011)

    Article  MathSciNet  MATH  Google Scholar 

  10. Dziok, J., Raina, R.K., Sokół, J.: On \(\alpha \)-convex functions related to shell-like functions connected with Fibonacci numbers. Appl. Math. Comput. 218(3), 996–1002 (2011). (MR2831345)

    MathSciNet  MATH  Google Scholar 

  11. Duren, P.L.: Univalent Functions, Grundlehren der Mathematischen Wissenschaften, vol. 259. Springer, New York (1983)

    Google Scholar 

  12. Falcón, S.: Plaza: On the Fibonacci \(k\)-numbers. Chaos Solit. Fract. 32(5), 1615–1624 (2007)

    Article  MATH  Google Scholar 

  13. Girgaonkar, V.B., Joshi, S.B.: Coefficient estimates for certain subclass of bi-univalent functions associated with Chebyshev polynomial. Ganita 68(1), 79–85 (2018)

    MathSciNet  MATH  Google Scholar 

  14. Güney, H.: Coefficient bounds for analytic bi-Bazilevič functions related to shell-like curves connected with Fibonacci numbers. Sahand Commun. Math. Anal. 16(1), 149–160 (2019)

    MATH  Google Scholar 

  15. Güney, H., Murugusundaramoorthy, G., Sokół, J.: Subclasses of bi-univalent functions related to shell-like curves connected with Fibonacci numbers. Acta Univ. Sapientiae Math. 10(1), 70–84 (2018)

    MathSciNet  MATH  Google Scholar 

  16. Güney, H.Ö., Murugusundaramoorthy, G., Sokół, J.: Certain subclasses of bi-univalent functions related to \(\kappa \)-Fibonacci numbers. Commun. Fac. Sci. Univ. Ank. Ser. A1 Math. Stat. 68(2), 1909–1921 (2019)

    Article  MathSciNet  MATH  Google Scholar 

  17. Güney, H., İlhan, S., Sokół, J.: An upper bound for third Hankel determinant of starlike functions connected with \(k\)-Fibonacci numbers. Bol. Soc. Mat. Mex. (3) 25(1), 117–129 (2019)

    Article  MathSciNet  MATH  Google Scholar 

  18. Güney, H., Sokól, J., İlhan, S.: Second Hankel determinant problem for some analytic function classes with connected \(\kappa \)-Fibonacci numbers. Acta Univ. Apulensis Math. Inform. No. 54, 161–174 (2018)

    MathSciNet  MATH  Google Scholar 

  19. Magesh, N., Balaji, V.K., Abirami, C.: Certain classes of bi-univalent functions related to Shell-like curves connected with Fibonacci numbers. ar**v:1810.06216v1

  20. Masih, V.S., Ebadian, A., Yalçin, S.: Some properties associated to a certain class of starlike functions. Math. Slovaca 69(6), 1329–1340 (2019)

    Article  MathSciNet  MATH  Google Scholar 

  21. Jahangiri, J.M., Hamidi, S.G., Halim, S.A.: Coefficients of bi-univalent functions with positive real part derivatives. Bull. Malays. Math. Sci. Soc. (2) 37(3), 633–640 (2014)

    MathSciNet  MATH  Google Scholar 

  22. Orhan, H., Magesh, N., Balaji, V.K.: Fekete–Szegö problem for certain classes of Ma-Minda bi-univalent functions. Afr. Mat. 27(5–6), 889–897 (2016)

    Article  MathSciNet  MATH  Google Scholar 

  23. Orhan, H., Magesh, N., Balaji, V.K.: Certain classes of bi-univalent functions with bounded boundary variation. Tbilisi Math. J. 10(4), 17–27 (2017)

    Article  MathSciNet  MATH  Google Scholar 

  24. Orhan, H., Magesh, N., Balaji, V.K.: Second Hankel determinant for certain class of bi-univalent functions defined by Chebyshev polynomials. Asian-Eur. J. Math. 12(2), 1950017 (2019)

    Article  MathSciNet  MATH  Google Scholar 

  25. Özgür, N.Y., Sokól, J.: On starlike functions connected with \(k\)-Fibonacci numbers. Bull. Malays. Math. Sci. Soc. 38(1), 249–258 (2015)

    Article  MathSciNet  MATH  Google Scholar 

  26. Pommerenke, C.: Univalent Functions. Vandenhoeck & Ruprecht, Göttingen (1975)

    MATH  Google Scholar 

  27. Raina, R.K., Sokół, J.: Fekete–Szegö problem for some starlike functions related to shell-like curves. Math. Slovaca 66(1), 135–140 (2016)

    Article  MathSciNet  MATH  Google Scholar 

  28. Sokół, J.: On starlike functions connected with Fibonacci numbers. Zeszyty Nauk. Politech. Rzeszowskiej Mat. No. 23, 111–116 (1999)

    MathSciNet  MATH  Google Scholar 

  29. Sokół, J., Raina, R.K., Yilmaz Özgür, N.: Applications of \(k\)-Fibonacci numbers for the starlike analytic functions. Hacet. J. Math. Stat. 44(1), 121–127 (2015)

    MathSciNet  MATH  Google Scholar 

  30. Srivastava, H.M., Bansal, D.: Coefficient estimates for a subclass of analytic and bi-univalent functions. J. Egypt. Math. Soc. 23(2), 242–246 (2015)

    Article  MathSciNet  MATH  Google Scholar 

  31. Srivastava, H.M., Bulut, S., Çağlar, M., Yağmur, N.: Coefficient estimates for a general subclass of analytic and bi-univalent functions. Filomat 27(5), 831–842 (2013)

    Article  MathSciNet  MATH  Google Scholar 

  32. Srivastava, H.M., Eker, S.S., Ali, R.M.: Coefficient bounds for a certain class of analytic and bi-univalent functions. Filomat 29(8), 1839–1845 (2015)

    Article  MathSciNet  MATH  Google Scholar 

  33. Srivastava, H.M., Gaboury, S., Ghanim, F.: Coefficient estimates for some subclasses of \(M\)-fold symmetric bi-univalent functions. Acta Univ. Apulensis Math. Inform. No. 41, 153–164 (2015)

    MathSciNet  MATH  Google Scholar 

  34. Srivastava, H.M., Mishra, A.K., Gochhayat, P.: Certain subclasses of analytic and bi-univalent functions. Appl. Math. Lett. 23(10), 1188–1192 (2010)

    Article  MathSciNet  MATH  Google Scholar 

  35. Srivastava, H.M., Murugusundaramoorthy, G., Magesh, N.: Certain subclasses of bi-univalent functions associated with the Hohlov operator. Glob. J. Math. Anal. 1(2), 67–73 (2013)

    Google Scholar 

  36. Tang, H., Deng, G.-T., Li, S.-H.: Coefficient estimates for new subclasses of Ma-Minda bi-univalent functions. J. Inequal. Appl. 2013, 317 (2013)

    Article  MathSciNet  MATH  Google Scholar 

  37. Tang, H., Magesh, N., Balaji, V.K., Abirami, C.: Coefficient inequalities for a comprehensive class of bi-univalent functions related with bounded boundary variation. J. Inequal. Appl. 237, 9 (2019)

    MathSciNet  MATH  Google Scholar 

  38. Zaprawa, P.: On the Fekete–Szegö problem for classes of bi-univalent functions. Bull. Belg. Math. Soc. Simon Stevin 21(1), 169–178 (2014)

    Article  MathSciNet  MATH  Google Scholar 

Download references

Funding

Not applicable.

Author information

Authors and Affiliations

Authors

Contributions

All authors are equally contributed in writing this manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Nanjundan Magesh.

Ethics declarations

Conflict of interest

The authors declare that there are no conflicts of interest regarding the publication of this manuscript.

Additional information

Nanjundan Magesh, Jodalli Nirmala, Jagadeesan Yamini and Sondekola Rudra Swamy dedicate this work to Prof. H. M. Srivastava on the occasion of his 80th birthday.

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Magesh, N., Nirmala, J., Yamini, J. et al. Initial estimates for certain subclasses of bi-univalent functions with \(\kappa \)-Fibonacci numbers. Afr. Mat. 34, 35 (2023). https://doi.org/10.1007/s13370-023-01077-1

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s13370-023-01077-1

Keywords

Mathematics Subject Classification

Navigation