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131:. His main emphasis lay on collecting and breeding butterflies. Prior to his death, he gave his outstanding collection of butterflies to the
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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
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Retired mathematics professor
Gerhard Ringel gives his world-class butterfly collection to UCSC
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Proceedings of the
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Topics in
Combinatorics and Graph Theory. Essays in Honour of Gerhard Ringel
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104:. In 1970 he left Germany due to bureaucratic consequences of the
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Besides his mathematical skills he was a widely acknowledged
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in 1951 with a thesis written under the supervision of
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50:and contributed significantly to the proof of the
518:Academic staff of the Free University of Berlin
65:Although born in Austria, Ringel was raised in
276:Bodendiek, Rainer; Henn, Rudolf, eds. (1990).
147:"Solution of the Heawood map-coloring problem"
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426:. You can help Knowledge (XXG) by
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285:. Heidelberg: Physica-Verlag HD.
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46:. He was one of the pioneers in
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16:German-American mathematician
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56:Ringel–Youngs theorem
30:(October 28, 1919 in
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363:by Gerhard Ringel"
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60:four color theorem
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