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Lecture given on August 1rst 1997 at the VIIIth International Conference on Symmetry Methods un Physics. JINR, Dubna, Russia.

Exapnded version of a lecture fiven at Naples, on October 25, 1991 at a Colloquium in memory of Léon Vanhove

Abstract : This paper studies the number of extrema (and their positions) of a countinuous Morse function on the Brillouin zone, when it…