In this note we obtain generalization of well known results of carbone and Conti,Sehgal and Singh and Tanimoto concerning the existence of best approximation an
Radial functions have become a useful tool in numerical mathematics. On the sphere they have to be identified with the zonal functions. We investigate zonal pol
The Conchy’s formula of entire functions f:Ck→C is used to establish Markov-Bernstein type inequalities of muhivariate polynomials with positive coefficients
We consider the computation of the. Cauchy principal value mtegralby quadrature formulaeof compound type, which are obtained by replacing f by a piecewise defin