Journal of Operator Theory, Vol. 64, No. 2 (Fall 2010), pp. 265-298 (34 pages) We prove some noncommutative analogues of a theorem proved by Plotkin and Rudin about isometries between subspaces of ...

A condition for the existence of Fermi coordinates derived in a previous paper (O'Raifeartaigh 1958) is used to establish some theorems concerning Riemannian spaces ...