Heinz Hopf
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Heinz Hopf was a German mathematician who worked on the fields of dynamical systems, topology and geometry.
Hopf in 1954
Hermann Weyl
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Hermann Klaus Hugo Weyl was a German mathematician, theoretical physicist, logician and philosopher. Although much of his working life was spent in Zürich, Switzerland, and then Princeton, New Jersey,
Hermann Weyl (left) with Ernst Peschl
The Theory of Groups and Quantum Mechanics (translated from the second, revised German edition by Howard P. Robertson)
Temps, espace, matière (French, 1922)