. . "Willi Ludwig August Rinow (February 28th, 1907 in Berlin \u2013 March 29th, 1979 in Greifswald) was a German mathematician who specialized in differential geometry and topology. Rinow was the son of a schoolteacher. In 1926, he attended the Humboldt University of Berlin, studying mathematics and physics under professors such as Max Planck, Ludwig Bieberbach, and Heinz Hopf. There, he received his doctorate in 1931 (\u00DCber Zusammenh\u00E4nge zwischen der Differentialgeometrie im Gro\u00DFen und im Kleinen, Math."@en .