DOI QR코드

DOI QR Code

Uniformly Close-to-Convex Functions with Respect to Conjugate Points

  • Bukhari, Syed Zakar Hussain (Department of Mathematics, Mirpur University of Science and Technology(MUST)) ;
  • Salahuddin, Taimoor (Department of Mathematics, Mirpur University of Science and Technology(MUST)) ;
  • Ahmad, Imtiaz (Department of Mathematics, Mirpur University of Science and Technology(MUST)) ;
  • Ishaq, Muhammad (Department of Mathematics, Mirpur University of Science and Technology(MUST)) ;
  • Muhammad, Shah (Department of Mathematics, College of Science, King Saud University)
  • Received : 2018.04.03
  • Accepted : 2018.12.19
  • Published : 2022.06.30

Abstract

In this paper, we introduce a new subclass of k-uniformly close-to-convex functions with respect to conjugate points. We study characterization, coefficient estimates, distortion bounds, extreme points and radii problems for this class. We also discuss integral means inequality with the extremal functions. Our findings may be related with the previously known results.

Keywords

Acknowledgement

The Authors would like to thank Worthy Vice Chancellor MUST, Mirpur, AJK for his untiring efforts for the promotion of research conducive environment at MUST.

References

  1. E. Aqlan, J. M. Jahangiri and S. R. Kulkarni, New classes of k-uniformly convex and starlike functions, Tamkang J. Math., 35(3)(2004), 261-266. https://doi.org/10.5556/j.tkjm.35.2004.207
  2. R. M. El-Ashwah and D. K. Thomas, Some subclasses of close-to-convex functions, J. Ramanujan Math. Soc., 2(1)(1987), 85-100.
  3. S. Z. H. Bukhari, M. Nazir and M. Raza, Some generalizations of analytic functions with respect to 2k-symmetric conjugate points, Maejo Int. J. Sci. Technol., 10(1)(2016), 1-12.
  4. S. Z. H. Bukhari, M. Raza and M. Nazir, Some generalizations of the class of analytic functions with respect to k-symmetric points, Hacet. J. Math. Stat., 45(1)(2016), 1-14.
  5. S. Z. H. Bukhari, T. Bulboaca and M. S. Shabbir, Subordination and superordination results for analytic functions with respect to symmetrical points, Quaest. Math., 41(1)(2018), 1-15. https://doi.org/10.2989/16073606.2017.1368732
  6. W. Janowski, Some extremal problems for certain families of analytic functions, Ann. Polon. Math., 28(1973), 297-326. https://doi.org/10.4064/ap-28-3-297-326
  7. S. Kanas and D. Raducanu, Some class of analytic functions related to conic domains, Math. Slovaca, 64(5)(2014), 1183-1196. https://doi.org/10.2478/s12175-014-0268-9
  8. J. E. Littlewood, On inequalities in the theory of functions, Proc. London Math. Soc., 23(1)(1925), 481-519. https://doi.org/10.1112/plms/s2-23.1.481
  9. N. Magesh, S,. Altinkaya, and S. Yalcin, Certain Subclasses of k-uniformly starlike functions associated with symmetric q-derivative operator, J. Comput. Anal. Appl., 24(8)(2018), 1464-1473.
  10. S. S. Miller and P. T. Mocanu, Differential subordinations: theory and applications, Marcel Dekker, Inc., New York(2000).
  11. R. Parvatham and S. Radha, On starlike and close-to-convex functions with respect to n-symmetric points, Indian J. Pure Appl. Math., 17(9)(1986), 1114-1122.
  12. V. Ravichandran, Starlike and convex functions with respect to conjugate points, Acta Math. Acad. Paedagog. Nyh'azi. (N.S.), 20(1)(2004), 31-37.
  13. K. Sakaguchi, On a certain univalent mapping, J. Math. Soc. Japan, 11(1959), 72-75. https://doi.org/10.2969/jmsj/01110072
  14. C. Selvaraj and K. A. Selvakumaran, New classes of k-uniformly convex and starlike functions with respect to other points, Acta Math. Univ. Comenianae, 48(1)(2009), 103-114.
  15. B. S,eker, M. Acu, and S. S. Eker, Subclasses of k-uniformly convex and k-starlike functions defined by Salagean operator, Bull. Korean Math. Soc., 48(1)(2011), 169-182. https://doi.org/10.4134/BKMS.2011.48.1.169
  16. T. N. Shanmugam, C. Ramachandran and V. Ravichandran, Fekete-Szego problem for subclasses of starlike functions with respect to symmetric points, Bull. Korean Math. Soc., 43(3)(2006), 589-598. https://doi.org/10.4134/BKMS.2006.43.3.589
  17. H. Silverman, A survey with open problems on univalent functions whose coefficients are negative, Rocky Mountain J. Math., 21(3)(1991), 1099-1125. https://doi.org/10.1216/rmjm/1181072932
  18. H. Silverman, Integral means for univalent functions with negative coefficients, Houston J. Math., 23(1)(1997), 169-174.
  19. H. Silverman, Univalent functions with negative coefficients, Proc. Amer. Math. Soc., 51(1975), 109-116. https://doi.org/10.1090/S0002-9939-1975-0369678-0
  20. H. M. Srivastava, S. Z. H. Bukhari and M. Nazir, A subclass of alpha -convex function with respect to ( 2j, k)-symmetric conjugate points, Bull. Iran. Math. Soc., 44(5)(2018), 1227-1242. https://doi.org/10.1007/s41980-018-0086-x
  21. Z. -G. Wang, A new subclass of quasi-convex functions with respect to k-symmetric points, Lobachevskii J. Math., 19(2005), 41-50.