Helmut Ulm

According to the annotation of this photo by Konrad Jacobs, it depicts Otto Toeplitz, E. Hagemann, D. Vieth, H. Ulm, Gottfried Köthe in 1930.

Helmut Ulm (born 21 June 1908 in Gelsenkirchen; died 13 June 1975) was a German mathematician who established the classification of countable periodic abelian groups by means of their Ulm invariants.

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