Projective planes and isoparametric hypersurfaces
The authors use so-called topological projective geometry to reprove the well-known classification of isoparametric hypersurfaces in spheres with three different principal curvatures, see \textit{E. Cartan} [Math. Z. 45, 335-367 (1939; Zbl 0021.15603)].
scientific article; zbMATH DE number 826780
scientific article