Anul LII 2007

S T U D I A

UNIVERSITATIS BABEŞ-BOLYAI

MATHEMATICA

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

SUMAR – CONTENTS – SOMMAIRE

Mohamed Achache, On the Approximation Numbers of Certain Volterra

Integral Operators between Lebesgue Spaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . …. 3

George A. Anastassiou, Optimal Multivariate Ostrowski Euler Type

Inequalities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Razvan V. Gabor, Boundary Value Problems for Systems of Second Order

Differential Equations of Mixed Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ….. 63

Ilie Mitran, On some Numeric Methods to Determinate the Guaranteed

Optimal Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Ovidiu T. Pop, On the Approximation by Associated GBS Operators of

Exponential Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..99

Monica Purcaru and Mirela Tarnoveanu, On the Transformations of

N-Linear Connections in the k-Osculator Bundle . . . . . . . . . . . . . . . . . . . . . ……... 111

Natalia Rosca, A Combined Monte Carlo and Quasi-Monte Carlo Method

for Estimating Multidimensional Integrals . . . . . . . . . . . . . . . . . . . . . . . . . . . …... . ..125

Somogyi Ildiko, Practical Quadrature Formulas Optimal from Efficiency

Point of View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 141

Book Reviews . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . …149