Asymptotics of the values of approximations in the mean for classes of differentiable functions by using biharmonic Poisson integrals

Abstract

Complete asymptotic decompositions are obtained for values of exact upper bounds of approximations of functions from the classes $W^r_1,\quad r \in N,$ and WJr, $\overline{W}^r_1,\quad r \in N\backslash\{1\}$, by their biharmonic Poisson integrals.