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| Keywords: ErichTrefftzPortrait.jpg Portrait of the German mathematician Erich Trefftz<sup> de </sup> 28 Feb 1888 21 Jan 1937 Journal Deutsche Mathematik Vol 2 Issue 5 22 Dec 1937 p 582; included in an obituary Erich Trefftz by Fritz Rehbock p 581-586 before 1938 photographer not mentioned in any source Anonymous-EU Deutsche Mathematik journal Scans by User Jochen Burghardt Erich Trefftz | ||||
