Karel Petr
Czech mathematician
From Wikipedia, the free encyclopedia
Karel Petr (Czech pronunciation: [ˈkarɛl ˈpɛtr̩]; 14 June 1868 – 14 February 1950) was a Czech mathematician.
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Biography
Petr was born on 14 June 1868 in Zbyslav Bohemia, Austria-Hungary (today part of Vrdy, Czech Republic).[1] He is known for the Petr–Douglas–Neumann theorem in plane geometry, which he proved in 1905 (in Czech)[2] and in 1908 (in German).[3][4] It was independently rediscovered by Jesse Douglas in 1940[5] and by Bernhard Neumann in 1941.[4][6]
Eduard Čech was a doctoral student of Petr at Charles University in Prague. Petr's doctoral students also included Bohumil Bydžovský and Václav Hlavatý.[7]
Petr died on 14 February 1950 in Prague.[1]
