High Quality Content by WIKIPEDIA articles! "Warsaw School of Mathematics" is the name given to a group of mathematicians who worked at Warsaw, Poland, in the two decades between the World Wars, especially in the fields of logic, set theory, point-set topology and real analysis. They published in the journal Fundamenta Mathematicae, founded in 1920 — one of the world`s first specialist pure-mathematics journals. It was in this journal, in 1933, that Alfred Tarski — whose illustrious career would a few years later take him to the University of California, Berkeley — published his celebrated theorem on the undefinability of the notion of truth.