What was an irrational number to an ancient Greek mathematician?
This is a brief biography of the Polish mathematician Władysław Orlicz (mostly known for Orlicz spaces), one of the members of the famous Lwów School of Mathematics (Polish School of Analysis in Lwów) who after World War II organized the Poznań School of Mathematics. This biography also includes his scientific achievements and many official scientific activities (honors and awards, membership in various scientific societies and editorial boards). There is a special section about Orlicz's connection...
We describe subgroups of GL2A which are normalized by elementary matrices for rings A satisfying the first stable range condition, Banach algebras A, von Neumann regular rings A, and other rings A.