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About: Twelvefold way     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatPermutations, within Data Space : dbpedia.org associated with source document(s)

Type: yago:Abstraction100002137yago:Change107296428yago:Event100029378yago:Happening107283608yago:PsychologicalFeature100023100yago:YagoPermanentlyLocatedEntityyago:Substitution107443761yago:Variation107337390yago:WikicatPermutations New Facet based on Instances of this Class

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.