We wish to offer here a didactic presentation, mainly based on G. Pólya’s original paper and by the light of various examples, of a topic of Combinatorics: Pólya’s (and Redfield’s) enumeration theorem. Our excuses for it just being that an oral version was exposed in one of the sessions corresponding to the year 1991 of the “Seminario Permanente de Actualización en Matemáticas de Logroño”, a meeting place for secondary teacher’s and university professors that as much owes to Chicho’s passion for Mathematics.
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