## MATHEMATICA

### TOME 50 (73), N° 1, 2008

**SOMMAIRE**

K.O. BABALOLA, New subclasses of analytic and univalent functions

involving certain convolution operators 3 ILIE COROVEI and VASILE POP, The Wilson version of d'Alembert's

functional equation on a class of 2-divisible nilpotent groups 13 CAMELIA DICU, On the multiplicity module of a pointed group 31 B.A. FRASIN, M. DARUS and S. SIREGAR, Some sufficient conditions

for univalence and subordination results of certain analytic and

univalent functions 39 DIMITRIOS N. GEORGIOU, SAEID JAFARI and TAKASHI NOIRI,

Characterizations of closed sets in product spaces 51 THOMAS KOTOULAS, Two-dimensional potentials generating a given

one-parameter family of orbits on a surface 59 S. LATHA and N. POORNIMA, On neighborhoods of certain classes of

analytic functions with negative coefficients 75 VERONICA O. NECHITA, Differential sandwich theorems for analytic

functions defined by the Dziok-Srivastava linear operator 85 ROGER YUE CHI MING, A note on annihilators and injectivity 95