Anul XLVII 2002

 

S T U D I A

UNIVERSITATIS BABEŞ-BOLYAI

 

 

MATHEMATICA

3

 

 

 

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

 

 

SUMAR CONTENTS SOMMAIRE

 

M. Banaru, On Nearly-Cosymplectic Hypersurfaces in Nearly-Kahlerian

Manifolds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

 

Daniel Breaz and Nicoleta Breaz, Two Integral Operators . . . . . . . . . . . . . . . . . . . . . . 13

 

Adriana Buică, Quasilinearization for the Forced Duffing Equation . . . . . . . . . . .. . . .21

 

Endre Buzogany, Ildiko Ilona Mezei and Viorica Varga, Two-Variable

Variational-Hemivariational Inequalities . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .31

 

Cristian Chifu-Oros, Functionals which Satisfy a Maximum Principle . . . . . . . . . . . .. 43

 

Rodica Covaci, X-Maximal Subgroups in Finite π-Solvable Groups with

Respect to a Schunck Class X . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 53

 

Iuliu Crivei, On Some -Pure Exact Sequences of Modules . . . . . . . . . . . . . . . . . . . . . . .63

 

Zoltan Finta, Quantitative Estimates for Some Linear and Positive

Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

 

Vasile Pop, Maximal Sets on a Hypersphere . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

 

Liana Ţopan, Critical Sets of 1-Dimensional Manifolds . . . . . . . . . .. . . . . . . . . . . . . . .91

 

Book Reviews . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99