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Hankel determinants for starlike and convex functions associated with sigmoid functions

Hankel determinants for starlike and convex functions associated with sigmoid functions AbstractThis paper is concerned with Hankel determinants for starlike and convexfunctions related to modified sigmoid functions. Sharp bounds are given for second and third Hankel determinants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Forum Mathematicum de Gruyter

Hankel determinants for starlike and convex functions associated with sigmoid functions

Forum Mathematicum , Volume 34 (1): 20 – Jan 1, 2022

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Publisher
de Gruyter
Copyright
© 2021 Walter de Gruyter GmbH, Berlin/Boston
ISSN
0933-7741
eISSN
1435-5337
DOI
10.1515/forum-2021-0188
Publisher site
See Article on Publisher Site

Abstract

AbstractThis paper is concerned with Hankel determinants for starlike and convexfunctions related to modified sigmoid functions. Sharp bounds are given for second and third Hankel determinants.

Journal

Forum Mathematicumde Gruyter

Published: Jan 1, 2022

Keywords: Starlike functions; convex functions; sigmoid functions; Hankel determinants; 30C45; 30C50

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