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Jean Leray
Jean Leray (1906-1998) was a French mathematician, who worked on both partial differential equations and algebraic topology.
His main work in topology was carried out while he was in a prisoner of war camp in Austria during 1940-1945. It originated together the ideas of spectral sequence[?] and sheaf. These were subsequently developed by many others, each separately becoming an important tool in homological algebra.
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