Abstract:
Wigner's classical theorem on symmetry transformations plays a fundamental role in quantum mechanics. It can be formulated, for example, in the following way: Every bijective transformation on the set ℒ of all 1-dimensional subspaces of a Hilbert space H which preserves the angle between the elements of ℒ is induced by either a unitary or an antiunitary operator on H. The aim of this paper is to extend Wigner's result from the 1-dimensional case to the case of n-dimensional subspaces of H with n∈ℕ fixed.
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Received: 28 August 2000 / Accepted: 30 October 2000
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Molnár, L. Transformations on the Set of All n-Dimensional Subspaces of a Hilbert Space Preserving Principal Angles. Commun. Math. Phys. 217, 409–421 (2001). https://doi.org/10.1007/PL00005551
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DOI: https://doi.org/10.1007/PL00005551