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Gerhard Ringel

Gerhard Ringel

German mathematician
Gerhard Ringel was a German mathematician. He was one of the pioneers in graph theory and contributed significantly to the proof of the Heawood conjecture, a mathematical problem closely linked with the four color theorem. Wikipedia
Born: October 28, 1919, Bad Pirawarth, Austria
Died: June 24, 2008 (age 88 years), Santa Cruz, CA