Papers - GFT Registry

Gehring-Hayman Inequality for Meromorphic Univalent Mappings

Bappaditya Bhowmik, Deblina Maity, Toshiyuki Sugawa · 2025 arXiv ↗

6 theorems finance

Universal convexity and range problems of shifted hypergeometric functions

Toshiyuki Sugawa, Li-Mei Wang, Chengfa Wu · 2023 arXiv ↗

13 theorems cryptography

Univalence Criteria and Analogs of the John Constant

Yong Chan Kim, Toshiyuki Sugawa · 2022 arXiv ↗

4 claims 8 theorems

Harmonic spirallike functions and harmonic strongly starlike functions

Xiu-Shuang Ma, Saminathan Ponnusamy, Toshiyuki Sugawa · 2021 arXiv ↗

10 theorems close-to-convex starlike/convex of order strongly starlike

Schur parameters and Carathéodory class

Ming Li, Toshiyuki Sugawa · 2019 arXiv ↗

10 theorems

Sharp inequalities for logarithmic coefficients and their applications

S. Ponnusamy, Toshiyuki Sugawa · 2019 arXiv ↗

11 theorems

A note on successive coefficients of convex functions

Ming Li, Toshiyuki Sugawa · 2016 arXiv ↗

10 theorems

An extremal problem for univalent functions

Toshiyuki Sugawa, Li-Mei Wang · 2015 arXiv ↗

8 theorems close-to-convex

Coefficient estimates of analytic endomorphisms of the unit disk fixing a point with applications to concave functions

Rintaro Ohno, Toshiyuki Sugawa · 2015 arXiv ↗

7 theorems

Notes on convex functions of order $α$

Toshiyuki Sugawa, Li-Mei Wang · 2015 arXiv ↗

14 theorems starlike/convex of order

On the second Hankel determinant of concave functions

Rintaro Ohno, Toshiyuki Sugawa · 2015 arXiv ↗

9 theorems cryptography

Univalent functions with half-integral coefficients

Naoki Hiranuma, Toshiyuki Sugawa · 2012 arXiv ↗

8 theorems close-to-convex

On power deformations of univalent functions

Yong Chan Kim, Toshiyuki Sugawa · 2011 arXiv ↗

8 theorems close-to-convex starlike/convex of order

Sharp norm estimate of Schwarzian derivative for a class of convex functions

Stanisława Kanas, Toshiyuki Sugawa · 2011 arXiv ↗

8 theorems cryptography

Variability regions of close-to-convex functions

Takao Kato, Toshiyuki Sugawa, Li-Mei Wang · 2011 arXiv ↗

18 theorems close-to-convex

Correspondence between spirallike functions and starlike functions

Yong Chan Kim, Toshiyuki Sugawa · 2010 arXiv ↗

13 theorems close-to-convex

NORM ESTIMATES OF THE PRE-SCHWARZIAN DERIVATIVES FOR CERTAIN CLASSES OF UNIVALENT FUNCTIONS

Yong Chan Kim, Toshiyuki Sugawa · 2006 link ↗

17 theorems close-to-convex

Indexed Papers