30th September 1913 (Tuesday)

BORN TODAY: in Warsaw – then in the Russian Empire, occupied by Germany from 1915 to 1918, successfully defended against Bolshevik aggression in 1920, invaded again by Germany in 1939, site of an unsuccessful uprising against the Germans in 1944, who then razed the city to the ground before Stalin’s Red Army “liberated” it in January 1945 – Samuel Eilenberg, emigre from Warsaw University (PhD in 1936) to Princeton and later Michigan, Indiana and Columbia: “one of the 20th century’s most renowned experts on algebraic topology (the use of algebraic techniques to study shape), and [he] developed a new field of mathematics called homological algebra. With Norman E. Steenrod he explained the Eilenberg-Steenrod axioms for a generalized homology theory, and with Saunders Mac Lane he explained their theory of transformations between mathematical categories.”  (!)



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