par Moshinsky, Marcos;Quesne, Christiane 
;Loyola, G.
Référence Annals of physics, 198, 1, page (103-131)
Publication Publié, 1990-02
;Loyola, G.Référence Annals of physics, 198, 1, page (103-131)
Publication Publié, 1990-02
Article révisé par les pairs
| Résumé : | The purpose of this paper is to show that the determination of the symmetry Lie algebra of a Hamiltonian with accidental degeneracy is more a matter of art than science, in the usual sense of these two words. Our thesis is defended through examples in which the Hamiltonians are linear combinations of the number operator N and the angular momentum M of a two dimensional oscillator. The standard approach to the problem when H = N or M, fails for H = N ± M or H = N ± |
