This book presents the construction of finitely “twisted” Laplace operators whose spectrum determines covering equivalence two Riemannian manifolds.

A generalized Stiefel manifold is the of orthonormal frames in a vector space with nondegenerated bilinear or hermitian form. In this article, Isometry group manifolds are computed at least up to connected components an explicit This done by considering natural nonassociative algebra m associated affine structure manifold, computing explicitly automorphism Aut(