Anul L 2005

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

Gh. Coman and I. Todea, On some applications of interpolation operators . . . . . . .. . . 3

Rodica Covaci, Projectors and hall π-subgroups in finite π -solvable groups . . . . .. . . 17

Jenică Crînganu, The p-Laplacian operator on the Sobolev space W1,p(Ω) . . . . . . . . . 25

Ya. M. Dymarskii, Quasipositive sturm-liouville problem . . . . . . . . . . . . . . . . . . . . . .33

Cristina-Ioana Fătu, On the invariance property of the Fisher information (II) . . . . . .41

I. Gasser, J. Struckmeier and Ioan Teleaga, On the numerical simulation

of a low-mach number flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Călin-Ioan Gheorghiu, On spectral properties of some Chebyshev-type methods

dimension vs. structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

Teodor Groşan and Ioan Pop, Radiation effects on free convection from

a vertical cone embedded in a fluid saturated porous medium . . . . . . . . . . . . . . . . . . . 67

Petr Kundrat, Asymptotic properties of the discretized pantograph equation . . . . . . . . 77

Zoltan Mako, Ferenc Szenkovits, Edit Garda-Matyas and Iharka Csillik, Classification

of near earth asteroids with artificial neural network . . . . . . . . . . . . . . . . . . . . . . . . . .85

Georgia Irina Oros, An application of Briot-Bouquet differential

superordinations and sandwich theorem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Diana Otrocol, A numerical method for approximating the solution of

a Lotka-Volterra system with two delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Ioan Popa, Extremal problems of Turan type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Binod Chandra Tripathy and Mikail Et, On generalized difference lacunary

statistical convergence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119

Book Reviews . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131