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Descripción Taschenbuch. Condición: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -In combinatorics, double counting, also called counting in two ways, is a combinatorial proof technique that involves counting the size of a set in two ways in order to show that the two resulting expressions for the size of the set are equal. In this technique, which van Lint & Wilson (2001) call one of the most important tools in combinatorics, one describes a finite set X from two perspectives leading to two distinct expressions for the size of the set. Since both expressions equal the size of the same set, they equal each other. 72 pp. Englisch. Nº de ref. del artículo: 9786130646837