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- Q113731 subject Q10018825.
- Q113731 subject Q15136896.
- Q113731 subject Q17679171.
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- Q113731 subject Q6456694.
- Q113731 subject Q6561429.
- Q113731 subject Q6647201.
- Q113731 subject Q8129740.
- Q113731 subject Q8205185.
- Q113731 subject Q8471937.
- Q113731 subject Q8735547.
- Q113731 subject Q8975520.
- Q113731 subject Q9292912.
- Q113731 abstract "Gerhard Ringel (October 28, 1919, in Kollnbrunn, Austria – June 24, 2008, in Santa Cruz, California) was an Austrian mathematician who earned his Ph.D. from the University of Bonn in 1951. He was one of the pioneers in graph theory and contributed significantly to the proof of the Heawood conjecture (now the Ringel-Youngs theorem), a mathematical problem closely linked with the Four Color Theorem.Although born in Kollnbrunn, Ringel was raised in Czechoslovakia and attended Charles University before being drafted into the German Army 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.Gerhard Ringel started his academic career as professor at the Free University Berlin. In 1970 he left Germany due to bureaucratic consequences of the German student movement, and continued his career at the University of California, Santa Cruz, having been invited there by his coauthor, Professor John W. T. (Ted) Youngs. He was awarded honorary doctors degrees from the University of Karlsruhe (TH) and the Free University 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.".
- Q113731 thumbnail Gerhard_Ringel_surfing.jpg?width=300.
- Q113731 wikiPageExternalLink Pearls_in_Graph_Theory.html?id=R6pq0fbQG0QC.
- Q113731 wikiPageWikiLink Q10018825.
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- Q113731 wikiPageWikiLink Q15136896.
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- Q113731 wikiPageWikiLink Q8129740.
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- Q113731 wikiPageWikiLink Q8471937.
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- Q113731 type Thing.
- Q113731 comment "Gerhard Ringel (October 28, 1919, in Kollnbrunn, Austria – June 24, 2008, in Santa Cruz, California) was an Austrian mathematician who earned his Ph.D. from the University of Bonn in 1951.".
- Q113731 label "Gerhard Ringel".
- Q113731 depiction Gerhard_Ringel_surfing.jpg.