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...be fired from his employment<!--why? please expand-->.<ref>Polak, 2005, p. 78.</ref> He then worked briefly as a director at the State Surveying Company, [[Category:1905 births]] ...

|birth_date = 78 '''Zhang Heng''' ({{zh-tspw|t=張衡|s=张衡|p=Zhāng Héng|w=Chang Heng}}) (CE&nbsp;78–139) was an [[Chinese astronomy|astronomer]], [[Chinese mathematics|mathema ...

...he took a position there, starting in late 1933.<ref>{{Harvnb|Dick|1981|pp=78–79}}; {{Harvnb|Kimberling|1981|pp=30–31}}.</ref> ...Equations with Prescribed Group)|journal=[[Mathematische Annalen]] |volume=78|year=1918|pages=221–229|doi=10.1007/BF01457099}}. ...