Article snapshot taken from[REDACTED] with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Ukrainian mathematician
Yaroslav Borysovych Lopatynskyi (1906–1981) was a Soviet mathematician. Born in Tbilisi, Lopatinskii acquired wide acclaim for his contributions to the theory of differential equations. He is especially known for his condition of stability for boundary-value problems in elliptic equations and for initial boundary-value problems in evolution PDEs.
