Klaus Wagner was a German mathematician, born on 31 March 1910 and died on 6 February 2000, known for his contributions to graph theory. Graph theory studies networks made of vertices joined by edges, and it asks questions such as when a network can be drawn in the plane without crossings. Wagner worked in this subject during the decades when it became a recognised part of mathematics, and his name is attached to a characterization of planar graphs that is taught in graph theory courses.
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Source Fary's theorem (Wikipedia)
Source Wagner's theorem - Wikipedia
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1. Klaus Wagner (Wikipedia)
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his contributions to graph theory
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was a German mathematician
In Branch: Graph Theory, Lead paragraph [in-branch]
graph theory
View the SourceWagner's theorem - Wikipedia
Proofs Credited: Wagner's Theorem, Lead paragraphQuote, Proofs Credited: Wagner's Theorem, Lead paragraph
In graph theory, Wagner's theorem is a mathematical forbidden graph characterization of planar graphs, named after Klaus Wagner, stating that a
Fary's theorem (Wikipedia)
Proofs Credited: Fary's Theorem, Lead paragraphQuote, Proofs Credited: Fary's Theorem, Lead paragraph
to be drawn. The theorem is named after István Fáry, although it was proved independently by Klaus Wagner (1936), Fáry (1948), and Sherman K. Stein (1951).
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