Isoparametric submanifolds
The author generalizes the definition of isoparametric submanifolds to higher codimensions as follows: a submanifold is isoparametric if the eigenvalues of the shape operator are constant along all parallel curves of normal vectors. Other definitions have been given by \textit{J. Eells} [On equivariant harmonic maps, Proc. Conf. Differ. Geom. and Differ. Equat. Fudan Univ. (China 1981; to appear)], \textit{S. Carter} and \textit{A. West} [Proc. Lond. Math. Soc., III. Ser. 51, 520-542 (1985)], and \textit{C.-L. Terng} [J. Differ. Geom. 21, 79-107 (1985)].
scientific article; zbMATH DE number 3947127