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Keywords: JohannesTropfkePortrait.jpg Portrait of Johannes Tropfke<sup> de </sup> Journal Deutsche Mathematik Vol 6 Issue 1 10 Sep 1941 p 114; included in an obituary Johannes Tropfke 14 X 1866 bis 10 XI 1939 by Jos E Hofmann p 114-118 before 1942 photographer not mentioned in any source Anonymous-EU Mathematicians from Germany 1866 births 1939 deaths Deutsche Mathematik journal Scans by User Jochen Burghardt |