We consider a subclass of univalent functions f (z) for which there corresponds a convex function g(z) of order α such that Re(zf'(z) / g(z)) ≥ β. We investigate the influence of the second coefficient of g(z) on this class. We also prove distortion, covering, and radius of convexity theorems
Published in | Applied and Computational Mathematics (Volume 4, Issue 5) |
DOI | 10.11648/j.acm.20150405.12 |
Page(s) | 342-345 |
Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
Copyright |
Copyright © The Author(s), 2015. Published by Science Publishing Group |
Analytic Function, Univalent Function, Convex Function of Order α, Close-to-Convexity, Fixed Second Coefficient, Radius of Convexity
[1] | O.P. Ahuja, “The influence of second coefficient on spirallike and Robertson functions”, Yokohama Math. J. 34(1-2) (1986) 3 - 1. |
[2] | H.S. Al-Amiri, “On close-to-star functions of order a”, Proc. Amer. Math. Soc. 29 (1971) 103 - 108. |
[3] | V.V. Anh, “Starlike functions with a fixed coefficient”, Bult. Austral. Math. Soc. 39(1) (1989) 145 - 158. |
[4] | P.L. Duren, “Univalent functions”, Springer-Verlag, N.Y. Berlin, Heidelberg, Tokyo, 1983. |
[5] | M. Finkelstein, “Growth estimates of convex functions”, Proc. Amer. Math. Soc. 18 (1967), 412 - 418. |
[6] | R.M. Goel, “The radius of convexity and starlikeness for certain classes of analytic functions with fixed coefficient”, Ann. Univ. Mariar Euric Sklodowska Sect. A, 25 (1971) 33 - 39. |
[7] | A.W. Goodman, “Univalent functions”, Vol. I, II, Mariner Tampa, Florida, 1983. |
[8] | T.H. Gronwall, “On the distortion in conformal mapping when the second coefficient in the mapping function has an assigned value”, Prof. Nat. Acad. Proc. 6 (1920) 300 - 302. |
[9] | W.K. Hayman, “Multivalent functions”, Cambridge University Press, 1958. |
[10] | W. Kaplan, “Close-to-convex functions”, Mich. Math. J. 1 (1952) 169 - 185. |
[11] | R.J. Libera, “Some radius of convexity problems”, Duke Math. J. 31 (1964) 143 - 158. |
[12] | A.E. Livingston, “On the radius of univalence of certain analytic functions”, Proc. Amer. Math. Soc. 17 (1965) 352 - 357. |
[13] | K.I. Noor, “Radius problem for a subclass of close-to-convex univalent functions”, Int. J. Math. Sci. 14(4) (1992) 719 - 726. |
[14] | M.S. Robertson, “On the theory of univalent functions”, Ann. Math. 37 (1936) 374 - 408. |
[15] | C. Selvaraj, “A subclass of close-to-convex functions”, Southeast Asian Bull. Math., 28 (2004) 113 - 123. |
[16] | C. Selvaraj and N. Vasanthi, “A certain subclass of close-to-convex functions defined in the unit disk”, Far East J. Math. Sci. 24(2) (2010) 241 - 253. |
[17] | H. Silverman, “On a close-to-convex functions”, Proc. Amer. Math. Soc. 36(2) (1972) 477 - 484. |
APA Style
Selvaraj Chellian, Stelin Simpson, Logu Sivalingam. (2015). On a Subclass of Close-to-Convex Functions Associated with Fixed Second Coefficient. Applied and Computational Mathematics, 4(5), 342-345. https://doi.org/10.11648/j.acm.20150405.12
ACS Style
Selvaraj Chellian; Stelin Simpson; Logu Sivalingam. On a Subclass of Close-to-Convex Functions Associated with Fixed Second Coefficient. Appl. Comput. Math. 2015, 4(5), 342-345. doi: 10.11648/j.acm.20150405.12
AMA Style
Selvaraj Chellian, Stelin Simpson, Logu Sivalingam. On a Subclass of Close-to-Convex Functions Associated with Fixed Second Coefficient. Appl Comput Math. 2015;4(5):342-345. doi: 10.11648/j.acm.20150405.12
@article{10.11648/j.acm.20150405.12, author = {Selvaraj Chellian and Stelin Simpson and Logu Sivalingam}, title = {On a Subclass of Close-to-Convex Functions Associated with Fixed Second Coefficient}, journal = {Applied and Computational Mathematics}, volume = {4}, number = {5}, pages = {342-345}, doi = {10.11648/j.acm.20150405.12}, url = {https://doi.org/10.11648/j.acm.20150405.12}, eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.acm.20150405.12}, abstract = {We consider a subclass of univalent functions f (z) for which there corresponds a convex function g(z) of order α such that Re(zf'(z) / g(z)) ≥ β. We investigate the influence of the second coefficient of g(z) on this class. We also prove distortion, covering, and radius of convexity theorems}, year = {2015} }
TY - JOUR T1 - On a Subclass of Close-to-Convex Functions Associated with Fixed Second Coefficient AU - Selvaraj Chellian AU - Stelin Simpson AU - Logu Sivalingam Y1 - 2015/08/19 PY - 2015 N1 - https://doi.org/10.11648/j.acm.20150405.12 DO - 10.11648/j.acm.20150405.12 T2 - Applied and Computational Mathematics JF - Applied and Computational Mathematics JO - Applied and Computational Mathematics SP - 342 EP - 345 PB - Science Publishing Group SN - 2328-5613 UR - https://doi.org/10.11648/j.acm.20150405.12 AB - We consider a subclass of univalent functions f (z) for which there corresponds a convex function g(z) of order α such that Re(zf'(z) / g(z)) ≥ β. We investigate the influence of the second coefficient of g(z) on this class. We also prove distortion, covering, and radius of convexity theorems VL - 4 IS - 5 ER -