A generalization of Wigner's unitary-antiunitary theorem to Hilbert modules

Details A generalization of Wigner's unitary-antiunitary theorem to Hilbert modules A generalization of Wigner's unitary-antiunitary theorem to Hilbert modules

1999-09-09

arxiv.org/abs/math/9909049v1

Mathematics

Functional Analysis

27 pages. To appear in J. Math. Phys

Scientific paper

10.1063/1.533044

Let H be a Hilbert $C^*$-module over a matrix algebra A. It is proved that any function $T:H\to H$ which preserves the absolute value of the (generalized) inner product is of the form $Tf=\phi(f)Uf$ $(f\in H)$, where $\phi$ is a phase-function and U is an A-linear isometry. The result gives a natural extension of Wigner's classical unitary-antiunitary theorem for Hilbert modules.

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