[en] A formula for the number of surjective mappings from a set with $a$ elements to a set with $b$ elements is proven in three different ways. The stress is put on methodology rather than on the result itself. [fr] On démontre, de trois manières différentes, une formule donnant le nombre de surjections d'un ensemble à $a$ éléments dans un ensemble à $b$ éléments, en insistant davantage sur la méthodologie que sur le résultat.
Disciplines :
Mathematics
Author, co-author :
Dupont, Pascal ; Université de Liège - ULiège > HEC-Ecole de gestion : UER > UER Opérations
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