Karel Petr
Karel Petr ( ; 14 June 1868 , Zbyslav , Austria-Hungary – 14 February 1950 , Prague , Czechoslovakia ) was one of the most renowned Czech mathematicians of the first half of the 20th century . 
<triplet> Karel Petr <subj> 14 June 1868 <obj> date of birth <subj> 14 February 1950 <obj> date of death <subj> Czechoslovakia <obj> country of citizenship