Anul XLVI 2001

S T U D I A

UNIVERSITATIS BABEŞ-BOLYAI

MATHEMATICA

2

Redacţia: 400084 Cluj-Napoca, Str. M. Kogălniceanu nr. 1 Tel: 405300

SUMAR – CONTENTS – SOMMAIRE

Professor Petru T. Mocanu on his 70th birthday. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

M.K. Aouf, H.E. Darwish and A.A. Attiya, On a class of certain analytic

functions of complex order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Sorin G. Gal, Starlike, Convex and alpha-convex functions of hyperbolic

complex and of dual complex variable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

H.M. Hossen, Generalization of certain classes of univalent functions with

negative coefficients. . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

H.M. Hossen and M.K. Aouf, On certain classes of functions defined by

convolutions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 59

Tunde Jakab, Convolutions of prestarlike functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Yusuke Okuyama, Norm estimates, coefficient estimates and some properties

of spiral-like functions. . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Horiana Ovesea and Irinel Radomir, On the univalence of convex functions

of complex order. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Nicolae N. Pascu, On univalent functions in a half-plane. . . . . . . . . . . . . .. . . . . . . . . . 93

Nicolae N. Pascu, Dorina Răducanu, Mihai N. Pascu and Radu N. Pascu,

On convex functions in an elliptical domain. . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Mihai N. Pascu and Veronica Şerbu, Non-analytic functions in an ellipse . . . . . . . . . 101

Virgil Pescar, New univalence criterion for certain integral operator. . . . . . . . . . .. . 107

Ioan A. Rus, Adrian Petruşel and Alina Sîntămărian, Data dependence of

the fixed points set of multivalued weakly Picard operators . . . . . . . . . . . . . . . . . . . . 111

Dorina Răducanu, On some classes of holomorphic functions. . . . . . . . . . . . . . . . . . . 123