In this paper we consider the Poisson integrals of functions of two variables for Hermite and Laguerre expansions in the spaces [wzór] and [wzór], respectively. We state some estimates of the rate of convergence of the Poisson integrals.
2
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In this paper we consider the so called composition operator being a self-mapping of the Banach algebra of the function of two variables with bounded total Φ-variation in the Schramm sense. The main result of the paper characterizes the composition operator mentioned above which has a generating function being Lipschitzian with respect to the second variable. The basic tool used in our considerations is the concept of the left-left regularization.
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In this paper we continue the investigation from [1]. There we have considered the case of the circle and the ellipse. Now we will take two-parametrical families of differentiable functions. For these families we determine extremality coefficients. In the last part of this paper we study the case of functions of two variables.
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