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Jean Leray (French: [l???]; 7 November 1906 ? 10 November 1998)[1] was a French mathematician
His main work in topology was carried out while he was in a prisoner of war camp in Edelbach, Austria from 1940 to 1945. He concealed his expertise on differential equations, fearing that its connections with applied mathematics could lead him to be asked to do war work.
Leray's work of this period proved seminal to the development of spectral sequences and sheaves.[4] These were subsequently developed by many others,[5] each separately becoming an important tool in homological algebra.
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