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Leray Jean Biography

French mathematician, who worked on both partial differential equations and algebraic topology. Leray wrote an important paper that founded the study of weak solutions of the Navier–Stokes equations. Together with Juliusz Schauder, he discovered a topological invariant, now called the Leray–Schauder degree, which they applied to prove the existence of solutions for partial differential equations lacking uniqueness. His main work in topology was carried out while he was in a prisoner of war camp in Edelbach, Austria from 1940 to 1945. Lerays work of this period proved seminal to the development of spectral sequences and sheaves. These were subsequently developed by many others, each separately becoming an important tool in homological algebra. Jean Leray died on 10 November 1998, aged 92, in La Baule. Link to Wikipedia biography Read less