books.google.it - The work of Hans Lewy (1904--1988) has had a profound influence in the direction of applied mathematics and partial differential equations, in particular, from the late 1920s. Two of the particulars are well known. The Courant--Friedrichs--Lewy condition (1928), or CFL condition, was devised to obtain...http://books.google.it/books/about/Hans_Lewy_Selecta.html?hl=it&id=mX8hTcETCc4C&utm_source=gb-gplus-shareHans Lewy Selecta
