Polishchuk M. V.
Approximation of some classes of set-valued periodic functions by generalized trigonometric polynomials
Ukr. Mat. Zh. - 2016. - 68, № 4. - pp. 449-459
We generalize some known results on the best, best linear, and best one-sided approximations by trigonometric polynomials from the classes of $2 \pi$ -periodic functions presented in the form of convolutions to the case of classes of set-valued functions.
Ukr. Mat. Zh. - 2015. - 67, № 9. - pp. 1163-1171
We consider the problem of optimization of the approximate integration of set-valued functions from the class specified by a given majorant of their moduli of continuity performed by using the values of these functions at n fixed or free points of their domain.