Abstract
AbstractLet n be a positive integer and H a Hilbert space. The description of the general form of bijective maps on the set of n-dimensional subspaces of H preserving the maximal principal angle has been obtained recently. This is a generalization of Wigner’s unitary-antiunitary theorem. In this paper we will obtain another extension of Wigner’s theorem in which the maximal principal angle is replaced by the minimal one. Moreover, in this case we do not need the bijectivity assumption.
Funder
Javna Agencija za Raziskovalno Dejavnost RS
Publisher
Springer Science and Business Media LLC
Subject
Applied Mathematics,Analysis