doctoral_advisor death_place death_date birth_place nationality fields workplaces birth_date known_for doctoral_students article_title name alma_mater
joseph ritt new york city , usa 30 october 1991 new york city , usa american mathematics columbia university 18 april 1916 lie -- kolchin theorem kolchin topology azriel rosenfeld irving adler ellis kolchin
 ellis kolchin columbia university
ellis kolchin

ellis robert kolchin -lrb- april 18 , 1916 -- october 30 , 1991 -rrb- was an american mathematician at columbia university .
kolchin earned a doctorate in mathematics from columbia university in 1941 under supervision of joseph ritt .
he was awarded a guggenheim fellowship in 1954 and 1961 .
kolchin worked on differential algebra and its relation to differential equations , and founded the modern theory of linear algebraic groups .
his doctoral students include azriel rosenfeld and irving adler .
