Volume 253, Issue 3

This issue is a translation of selected papers from Sibirskii Zhurnal Chistoii Prikladnoi Matematiki (Siberian Journal of Pure and Applied Mathematics) edited by Sergey S. Goncharov, Vol.18, No. 1, 3, 4, 2018. Translated into English and edited by Tamara Rozhkovskaya (rozhk@math.nsc.ru).