Gerhard Ringel: Difference between revisions

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Gerhard Ringel (born October 28, 1919, Kolnbrunn, Austria. Died June 24, 2008, Santa Cruz, California) is a German mathematician who earned his Ph.D. from the University of Bonn in 1951. He is one of the pioneers in graph theory and contributed significantly to the proof of the Heawood conjecture (now Ringel-Youngs theorem).

Gerhard Ringel spent much of his career at the University of California, Santa Cruz, where he also spent time surfing and collecting butterflies.

Ringel, Gerhard (1968). "Solution of the Heawood map-coloring problem". Proc. Nat. Acad. Sci. USA. 60: 438–445. doi:10.1073/pnas.60.2.438. MR0228378. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
Hartsfield, Nora (1990). Pearls in graph theory. Academic Press, Boston, MA. ISBN 0-12-328552-6. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

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	'''Gerhard Ringel''' (born [[October 28]], [[1919]], Kolnbrunn, Austria) is a German [[mathematician]] who earned his Ph.D. from the [[University of Bonn]] in 1951. He is one of the pioneers in graph theory and contributed significantly to the proof of the [[Heawood conjecture]] (now [[Ringel-Youngs_theorem\|Ringel-Youngs theorem]]).		'''Gerhard Ringel''' (born [[October 28]], [[1919]], Kolnbrunn, Austria. Died June 24, 2008, Santa Cruz, California) is a German [[mathematician]] who earned his Ph.D. from the [[University of Bonn]] in 1951. He is one of the pioneers in graph theory and contributed significantly to the proof of the [[Heawood conjecture]] (now [[Ringel-Youngs_theorem\|Ringel-Youngs theorem]]).

	Gerhard Ringel spent much of his career at the [[University of California, Santa Cruz]], where he also spent time surfing and collecting butterflies.		Gerhard Ringel spent much of his career at the [[University of California, Santa Cruz]], where he also spent time surfing and collecting butterflies.