Anul LIV 2009

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

F. Bozkurt, I. Ozturk and S. Ozen, The Global Behavior of the Difference Equation . . . . . . 3

Luminita-Ioana Cotırla, A Differential Sandwich Theorem for Analytic

Functions Defined by the Integral Operator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...................13

Iuliu Crivei and Septimiu Crivei, Associated Classes of Modules . . . . . . . . . . . ......... ........23

Salah Drabla and Zhor Lerguet, Variational Analysis of a

Elastic-Viscoplastic Contact Problem with Friction and Adhesion . . . . . . . .........................33

Bogdan Iftimie and Marinela Marinescu, A Construction of Admissible Strategies for

American Options Associated with Piecewise Continuous Processes . . . . . . . . . . . . . . . 53

Santosh B. Joshi, On Subclasses of Prestarlike Functions with Negative

Coefficients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........ . 65

Salah Mecheri and Aissa Nasli Bakir, Fuglede-Putnam Theorem for

log-Hyponormal or Class Y Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................... 75

G. Murugusundaramoorthy and N. Magesh, Differential Subordinations and

Superordinations for Analytic Functions Defined by Convolution Structure . . . . . . . . . . .....83

Mohamed Selmani, A Piezoelectric Frictionless Contact Problem with

Adhesion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ......... 97

Elena Iulia Stoica-Laze, On the Stancu Type Linear Positive Operators

of Approximation Constructed by using the Beta and the Gamma Functions . . . . . . . . . .117