Characteristics of the linear and nonlinear approximations of the Nikol’skii-Besov-type classes of periodic functions of several variables. (English. Ukrainian original) Zbl 1536.42024
J. Math. Sci., New York 274, No. 3, 307-326 (2023); translation from Ukr. Mat. Visn. 20, No. 2, 161-185 (2023).