Zobrazeno 1 - 10
of 104
pro vyhledávání: '"Toshiyuki Sugawa"'
Autor:
Toshiyuki Sugawa, Tanran Zhang
Publikováno v:
Bulletin of Mathematical Sciences, Vol 8, Iss 2, Pp 307-323 (2017)
Abstract We define a distance function on the bordered punctured disk $$0
Externí odkaz:
https://doaj.org/article/1880d3ba67134af7a764db1135463c94
Autor:
Toshiyuki Sugawa
Publikováno v:
Mathematics, Vol 9, Iss 7, p 706 (2021)
We consider the inverse function z=g(w)=w+b2w2+⋯ of a normalized convex univalent function w=f(z)=z+a2z2+⋯ on the unit disk in the complex plane. So far, it is known that |bn|≤1 for n=2,3,⋯,8. On the other hand, the inequality |bn|≤1 is not
Externí odkaz:
https://doaj.org/article/6efebca20c5f494895fa7d922f495bf8
Publikováno v:
Monatshefte für Mathematik. 199:363-375
Harmonic functions are natural generalizations of conformal mappings. In recent years, a lot of work have been done by some researchers who focus on harmonic starlike functions. In this paper, we aim to introduce two classes of harmonic univalent fun
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::786d5884b853fa3353fe038688eb8232
https://doi.org/10.1007/s00605-022-01708-y
https://doi.org/10.1007/s00605-022-01708-y
Autor:
Toshiyuki SUGAWA1, Li-Mei WANG2 wangmabel@163.com
Publikováno v:
Interdisciplinary Information Sciences. 2021, Vol. 27 Issue 1, p93-106. 14p.
Publikováno v:
Sibirskii matematicheskii zhurnal. 62:845-863
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f48a0153ad677f633ec5dc9f3c564b24
https://doi.org/10.33048/smzh.2021.62.412
https://doi.org/10.33048/smzh.2021.62.412
Publikováno v:
Siberian Mathematical Journal. 62:691-706
For a non-empty compact set $E$ in a proper subdomain $\Omega$ of the complex plane, we denote the diameter of $E$ and the distance from $E$ to the boundary of $\Omega$ by $d(E)$ and $d(E,\partial\Omega),$ respectively. The quantity $d(E)/d(E,\partia
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::738add5f73a5c72644ccc321474c04ed
https://doi.org/10.1134/s0037446621040121
https://doi.org/10.1134/s0037446621040121
Publikováno v:
Computational Methods and Function Theory. 20:539-558
For a given ring (domain) in $$\overline{\mathbb {R}}^n$$ , we discuss whether its boundary components can be separated by an annular ring with modulus nearly equal to that of the given ring. In particular, we show that, for all $$n\ge 3$$ , the stan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ff2687c287a69548019f2b55dcb0d956
https://doi.org/10.1007/s40315-020-00340-x
https://doi.org/10.1007/s40315-020-00340-x
Autor:
Toshiyuki SUGAWA1, Li-Mei WANG2 wangmabel@163.com
Publikováno v:
Interdisciplinary Information Sciences. 2019, Vol. 25 Issue 1, p45-52. 8p.
Publikováno v:
Computational Methods and Function Theory. 19:455-472
In this paper, we consider the class of functions of bounded boundary rotation and some generalizations and refinements of the class. We will see that several results can be understood more naturally by introducing the Hornich operations to these cla
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8e472fe6583c94b4f66faecdc4863a86
https://doi.org/10.1007/s40315-019-00276-x
https://doi.org/10.1007/s40315-019-00276-x
Autor:
Rintaro Ohno1 rohno@ims.is.tohoku.ac.jp, Toshiyuki Sugawa1 sugawa@math.is.tohoku.ac.jp
Publikováno v:
Kyoto Journal of Mathematics. 2018, Vol. 58 Issue 2, p227-241. 15p.