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[en] In this article we want to explain how groups are used in quantum physics. We use the simplest example, the rigid rotator. In Sect. 1 we briefly review of quantum mechanical notions. Section 2 presents the symmetry group, Sect. 3 the spectrum generating group in nonrelativistic physics. Section 4 describes how these ideas can be generalized to the nonrelativistic case, when the combination of symmetry group and spectrum generating group is no more trivial. (orig./HSI)
Source
Hennig, J.D.; Luecke, W. (Technische Univ. Clausthal, Clausthal-Zellerfeld (Germany, F.R.). Arnold-Sommerfeld-Institut fuer Mathematische Physik); Tolar, J. (Ceske Vysoke Uceni Technicke, Prague (Czechoslovakia). Fakulta Jaderna a Fysikalne Inzenyrska) (eds.); Lecture notes in physics; no. 379; 291 p; ISBN 3-540-53941-7; 
; 1991; p. 207-226; Springer; Berlin (Germany, F.R.)
; 1991; p. 207-226; Springer; Berlin (Germany, F.R.)