Editing Heinz Hopf (section)

==Early life and education==
Hopf was born in Gräbschen, [[German Empire]] (now {{ill|Grabiszyn|pl|Grabiszyn-Grabiszynek}}, part of [[Wrocław]], [[Poland]]), the son of Elizabeth (née Kirchner) and Wilhelm Hopf. His father was born Jewish and converted to Protestantism a year after Heinz was born; his mother was from a Protestant family.<ref>{{cite web| url= http://www-history.mcs.st-andrews.ac.uk/Printonly/Hopf.html |title= Heinz Hopf| publisher= University of St Andrews}}</ref><ref>{{cite web | url= http://www.robertnowlan.com/pdfs/Hopf,%20Heinz.pdf | archive-url= https://web.archive.org/web/20110106023144/http://www.robertnowlan.com/pdfs/Hopf,%20Heinz.pdf | url-status= dead | archive-date= 6 January 2011 | title= Hopf, Heinz | website= RobertNowlan.com }}</ref>

Hopf attended [[Karl Mittelhaus]] higher boys' school from 1901 to 1904, and then entered the König-Wilhelm-[[Gymnasium (school)|Gymnasium]] in Breslau. He showed mathematical talent from an early age. In 1913 he entered the [[Silesian Friedrich Wilhelm University]] where he attended lectures by [[Ernst Steinitz]], [[Adolf Kneser]], [[Max Dehn]], [[Erhard Schmidt]], and [[Rudolf Sturm]]. When [[World War I]] broke out in 1914, Hopf eagerly enlisted. He was wounded twice and received the iron cross (first class) in 1918.

After the war Hopf continued his mathematical education in [[Heidelberg]] (winter 1919/20 and summer 1920)<ref>{{cite web| url=http://histmath-heidelberg.de/homo-heid/hopf.htm |title=Heinz Hopf|publisher=Historia Mathematica Heidelbergensis}}</ref> and [[Berlin]] (starting in winter 1920/21). He studied under [[Ludwig Bieberbach]] and received his doctorate in 1925.