Gerhard Ringel
Gerhard Ringel (October 28, 1919 in
Ringel–Youngs theorem), a mathematical problem closely linked with the four color theorem
.
Although born in Austria, Ringel was raised in Czechoslovakia and attended Charles University before being drafted into the Wehrmacht in 1940 (after Germany had taken control of much of what had been Czechoslovakia). After the war Ringel served for over four years in a Soviet prisoner of war camp.[1]
He earned his
German student movement, and continued his career at the University of California, Santa Cruz, having been invited there by his coauthor, John W. T. (Ted) Youngs. He was awarded honorary doctorate degrees from the Karlsruhe Institute of Technology and the Free University of Berlin
.
Besides his mathematical skills he was a widely acknowledged
entomologist. His main emphasis lay on collecting and breeding butterflies. Prior to his death, he gave his outstanding collection of butterflies to the UCSC Museum of Natural History Collections.[3]
Publications
- Ringel, Gerhard; Youngs, J.W.T. (1968). "Solution of the Heawood map-coloring problem". PMID 16591648.
- Ringel, Gerhard (1974). Map color theorem. Berlin: Springer. OCLC 679997454.
- ISBN 0-12-328552-6.
References
- MR 1100014.
- ^ Gerhard Ringel at the Mathematics Genealogy Project
- ^ Retired mathematics professor Gerhard Ringel gives his world-class butterfly collection to UCSC Archived 2012-03-05 at the Wayback Machine, UC Santa Cruz Review, Fall 2006
- .
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