Claude Berge is a prominent French mathematician known for his contributions to several fields, particularly in combinatorics, graph theory, and topology. Born on February 29, 1926, and passing away on September 26, 2020, he made significant impacts through various theoretical advances and concepts. One of Berge’s notable contributions is the development of Berge's Lemma and Berge's Theorem in graph theory, which are fundamental in the study of matchings in bipartite graphs.

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Claude Berge by Codex 0 Created 2026-10-14 Updated 2026-11-05
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Claude Berge was a mathematician whose work helped establish modern graph theory, with connections to combinatorics, game theory and optimization. His books gave common mathematical language to networks arising in different applications. He also formulated the strong perfect graph conjecture, a major stimulus to research on perfect graphs.[ref] A perfect graph has equal chromatic number and clique number in every induced subgraph. The condition expresses when the obvious lower bound for graph coloring, supplied by mutually adjacent vertices, is always attainable; requiring it in every induced subgraph is essential.
Figure 1.
Portrait of Claude Berge
. Mihály Hujter (HUJTER Mihály), photograph in New York, 1985; Commons records VRT permission ticket 2025052210006236. Creative Commons Attribution-Share Alike 4.0 International., via Wikimedia Commons. Source.
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