Claude Berge (June 5, 1926 – June 30, 2002) was a French mathematician active in discrete mathematics and more specifically combinatorics and graph_theory. He is particularly remembered for his book Graph Theory and Its Applications (1958) which was translated in several languages and brought the mathematical theory of graphs to a wide audience. He also initiated the study of perfect graphs. June 5 is the 156th day of the year in the Gregorian calendar (157th in leap years), with 209 days remaining. ... 1926 (MCMXXVI) was a common year starting on Friday (link will take you to calendar). ... June 30 is the 181st day of the year (182nd in leap years) in the Gregorian Calendar, with 184 days remaining. ... For album titles with the same name, see 2002 (album). ... Discrete mathematics, also called finite mathematics, is the study of mathematical structures that are fundamentally discrete, in the sense of not supporting or requiring the notion of continuity. ... Combinatorics is a branch of mathematics that studies collections (usually finite) of objects that satisfy specified criteria. ... A labeled graph with 6 vertices and 7 edges. ... In graph theory, a perfect graph is a graph in which the chromatic number of every induced subgraph equals the clique number of that subgraph. ...