Anul LIV                                                                                                                                                                                                                                                                2009

 

S T U D I A

                        UNIVERSITATIS BABEŞ-BOLYAI

 

 

                                     MATHEMATICA

                                                 4

 

 

 

 

 

 

SUMAR – CONTENTS – SOMMAIRE

 

 

Petru Blaga, Teodora Catinas, Gheorghe Coman, Bernstein-Type

Operators on Tetrahedrons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

 

Paula Curt, Subordination Chains and Quasiconformal Extensions of Holomorphic

Mappings in Cn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ......................19

 

Emil A. Danciu, On Applications of the Reproducing Kernel Method for

Construction of Cubature Formulas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...... . . 27

 

Dorel I. Duca, Eugenia Duca, Optimization Problems and -Approximated

Optimization Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

 

Remus D. Ene, Adara M. Blaga, Thermal Stresses in a Thin Porous Plate . . ......63

 

Mohammad Al-Hawari, New Estimate for the Numerical Radius of a Given

Matrix and Bounds for the Zeros of Polynomials . . . . . . . . . . . . . . . . . . . . . . . . ...........73

 

Mihail Megan, Larisa Biris, Functionals on Normed Sequence Spaces and

Uniform Exponential Instability of Evolution Operators . . . . . . . . . . . . . . . . . ...............81

 

Vasile Mihesan, On a General Class of Beta Approximating Operators of

Second Kind . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

 

Johnson O. Olaleru, On the Convergence Rates of Picard, Mann and

Ishikawa Iterations of Generalized Contractive Operators . . . . . . . . . . . . . . ................103

 

Daniel N. Pop, Error Bound for the Solution of a Polylocal Problem with

a Combined Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

 

Ioan A. Rus, Ulam Stability of Ordinary Differential Equations . . . . . . . . . . . . . . . . 125

 

Shichang Shu, Complete Submanifolds in a Hyperbolic Space . . . . . . . . . . . . . . . . ....135

 

T. A. K. Sinha, Vijay Gupta, P. N. Agrawal, Asha Ram Gairola,

Inverse Theorem for an Iterative Combination of Bernstein-Durrmeyer Polynomials .  . . 153

 

Dimitrie D. Stancu, Elena Iulia Stoica, On the use of Abel-Jensen Type

Combinatorial Formulas for Construction and Investigation of Some

Algebraic Polynomial Operators of Approximation . . . . . . . . . . . . . . . . . . . . . .............167

 

Book Reviews . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  183