German mathematician working in geometry, in particular the classification of regular polyhedra and Hilbert's axioms.
Also made contributions in analysis, including to Carathéodory's theory of measure.
With Michel Plancherel, made contributions in ergodic theory and dynamical systems.
- Born: 24 February 1887 in Fürth, Germany
- Died: 15 September 1959 in Lafayette, Indiana
Theorems and Definitions