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By Ewa Orlowska, Andrzej Szalas. Edited by Ewa Orlowska. The modern origins of the theory of relations are due to Alfred Tarski (14 January 1902, Warsaw -26 October 1983, Berke ley). His paper' On the calculus of Relations' published in 1941 gave rise to an algebraic theory of relations which is still extensively studied.
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