Authors: Manfred Buth
The leading idea of this paper is to prove the theorem of Wigner with concepts and methods inspired by geometry. The exercise mentionned in the title has two functions: On the one hand it can serve as a pedagogical text in order to make the reader acquainted with the essential features of the theorem and its proof. On the other hand it will turn out to be the core of the general proof.
Comments: 6 pages
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