Volume 251, Issue 6

This issue is a translation of Problemy Matematicheskogo Analiza (Problems in Mathematical Analysis), No. 107, 2020. Editorial Board of PMA: N. Uraltseva (Main Editor), N. Ivochkina, A. Laptev, V. Maz’ya, V. Osmolovskii, B. Plamenevskii, G. Rozenblyum, D. Yafaev. Translated into English and edited by Tamara Rozhkovskaya.