found: Wikipedia, August 14, 2015(Paul Lévy (mathematician); Paul Pierre Lévy; born September 15,1886 in Parisl; died December 15, 1971 in Paris; French mathematician who was active in probability theory, introducing martingale and Lévy flight; Lévy processes, Lévy measures, Lévy's constant, the Lévy distribution, the Lévy skew alpha-stable distribution, the Lévy area, the Lévy arcsine law, and the non-fractal Lévy C curve are also named after him; Lévy attended the École Polytechnique and published his first paper in 1905, at the age of nineteen, while still an undergraduate; after graduation he spent a year in military service and then studied for three years at the École des Mines, where he became a professor in 1913; during World War I Lévy conducted mathematical analysis work for the French Artillery; in 1920 he was appointed Professor of Analysis at the École Polytechnique, where his students included Benoît Mandelbrot and Georges Matheron; he remained at the École Polytechnique until his retirement in 1959, with a gap during World War II after his 1940 firing because of the Vichy Statute on Jews; Lévy received a number of honours, including membership at the French Academy of Sciences and honorary membership at the London Mathematical Society; his daughter Marie-Hélène Schwartz and son-in-law Laurent Schwartz were also notable mathematicians)