Twelvefold way
Systematic classification of 12 related enumerative problems concerning two finite sets / From Wikipedia, the free encyclopedia
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In combinatorics, the twelvefold way is a systematic classification of 12 related enumerative problems concerning two finite sets, which include the classical problems of counting permutations, combinations, multisets, and partitions either of a set or of a number. The idea of the classification is credited to Gian-Carlo Rota, and the name was suggested by Joel Spencer.[1]
This article may be too technical for most readers to understand. (March 2019) |