Edited sentence: Banach successfully colaborated with many of his Ukrainian colleagues both in Lviv, Ukraine, and in the capital of Ukraine, Kyiv.Banach was a member of the National Academy of Science of Ukraine.In 1939-1941 and 1944-1945, when Lviv was liberated from the occupation by Nazi Germany, Banach served as a Chair of the Department of Mathematics at Lviv Ivan Franko National Ukrainian University.Major Banach books were translated from Polish and published by Ukrainian scientists - sometimes, for the first time in a European language.Stefan Banach participated in creation and advancement of the school of Ukrainian mathematics at Lviv Ivan Franko National Ukrainian University (the new name of Lwow University)