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On certain coefficient bounds for multivalent functions

Fatma Altuntaş, Muhammet Kamali (2009)

Annales UMCS, Mathematica

In the present paper, the authors obtain sharp upper bounds for certain coefficient inequalities for linear combination of Mocanu α-convex p-valent functions. Sharp bounds for [...] and [...] are derived for multivalent functions.

On certain general integral operators of analytic functions

B. Frasin (2012)

Annales UMCS, Mathematica

In this paper, we obtain new sufficient conditions for the operators Fα1,α2,…,αn,β(z) and Gα1,α2,…,αn,β(z) to be univalent in the open unit disc U, where the functions f1, f2, …, fn belong to the classes S*(a, b) and K(a, b). The order of convexity for the operators Fα1,α2,…,αn,β(z) and Gα1,α2,…,αn,β(z) is also determined. Furthermore, and for β = 1, we obtain sufficient conditions for the operators Fn(z) and Gn(z) to be in the class K(a, b). Several corollaries and consequences of the main results...

On certain multivalent functions.

Nunokawa, Mamoru, Owa, Shigeyoshi, Sekine, Tadayuki, Yamakawa, Rikuo, Saitoh, Hitoshi, Nishiwaki, Junichi (2007)

International Journal of Mathematics and Mathematical Sciences

On certain subclasses of analytic functions associated with the Carlson–Shaffer operator

Jagannath Patel, Ashok Kumar Sahoo (2015)

Annales UMCS, Mathematica

The object of the present paper is to solve Fekete-Szegö problem and determine the sharp tipper bound to the second Hankel determinant for a certain class ℛλ(a, c, A, B) of analytic functions in the unit disk. We also investigate several majorization properties for functions belonging to a subclass ℛλ(a, c, A, B) of ℛλ(a,c, A, B) and related function classes. Relevant connections of the main results obtained here with those given by earlier workers on the subject are pointed out.

On certain subclasses of analytic functions involving a linear operator

J. Patel, G. P. Mohapatra (2002)

Annales Polonici Mathematici

A certain general class 𝓢(a,c,A,B) of analytic functions involving a linear operator is introduced. The objective is to investigate various properties and characteristics of this class. Several applications of the results (obtained here) to a class of fractional calculus operators are also considered. The results contain some of the earlier work in univalent function theory.

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