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Maps on the  -dimensional subspaces of a Hilbert space preserving principal angles |
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| Authors: | Lajos Molná r |
| Institution: | Institute of Mathematics, P.O. Box 12, University of Debrecen, H-4010 Debrecen, Hungary |
| Abstract: | In a former paper we studied transformations on the set of all  -dimensional subspaces of a Hilbert space  which preserve the principal angles. In the case when  , we could determine the general form of all such maps. The aim of this paper is to complete our result by considering the problem in the remaining case  . |
| Keywords: | Wigner's theorem projections subspaces principal angles preservers |
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