About Karel Petr
Lived 1868 – 1950 (aged 81). Karel Petr was a Czech mathematician and university teacher.
Karel Petr (; 14 June 1868 – 14 February 1950) was a Czech mathematician.
Biography Petr was born on 14 June 1868 in Zbyslav Bohemia, Austria-Hungary (today part of Vrdy, Czech Republic). He is known for the Petr–Douglas–Neumann theorem in plane geometry, which he proved in 1905 (in Czech) and in 1908 (in German). It was independently rediscovered by Jesse Douglas in 1940 and by Bernhard Neumann in 1941.
Eduard Čech was a doctoral student of Petr at Charles University in Prague. Petr's doctoral students also included Bohumil Bydžovský and Václav Hlavatý.
Petr died on 14 February 1950 in Prague.
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Frequently asked questions
Who was Karel Petr?
Czech mathematician
When was Karel Petr born?
Karel Petr was born on 14 June 1868 in Zbyslav.
When did Karel Petr die?
Karel Petr died on 14 February 1950 in Prague.
What was Karel Petr's occupation?
Karel Petr was a mathematician and university teacher.
What nationality was Karel Petr?
Karel Petr was Czech.
Sources & further reading
Cite this page
APA: Biography.guide. (2026). Karel Petr. https://biography.guide/karel-petr/
MLA: "Karel Petr." Biography.guide, https://biography.guide/karel-petr/.
Chicago: "Karel Petr." Biography.guide. https://biography.guide/karel-petr/.
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