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Some inequalities involving multivalent functions

Shigeyoshi Owa; Mamoru Nunokawa; Hitoshi Saitoh — 1994

Annales Polonici Mathematici

The object of the present paper is to derive some inequalities involving multivalent functions in the unit disk. One of our results is an improvement and a generalization of a result due to R. M. Robinson [4].

Sufficient conditions for multivalent starlikeness

Shigeyoshi Owai; Mamoru Nunokawa; Hitoshi Saitoh — 1995

Annales Polonici Mathematici

Let 𝕊*(p) be the class of functions f(z) which are p-valently starlike in the open unit disk 𝕌. Two sufficient conditions for a function f(z) to be in the class 𝕊*(p) are shown.

New coefficient inequalities for starlike and convex functions.

Nunokawa, Mamoru; Owa, Shigeyoshi; Saitoh, Hitoshi; Takahashi, Norihiro — 2002

General Mathematics

On certain multivalent functions.

Nunokawa, Mamoru; Owa, Shigeyoshi; Sekine, Tadayuki; Yamakawa, Rikuo; Saitoh, Hitoshi; Nishiwaki, Junichi — 2007

International Journal of Mathematics and Mathematical Sciences

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