Abstract
Let V be a separable Hilbert space, possibly infinite dimensional. Let St(p,V) be the Stiefel manifold of orthonormal frames of p vectors in V, and let Gr(p,V) be the Grassmann manifold of p-dimensional subspaces of V. We study the distance and the geodesics in these manifolds, by reducing the matter to the finite dimensional case. We then prove that any two points in those manifolds can be connected by a minimal geodesic, and characterize the cut locus.
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