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Computing (FOLDOC) dictionary (also found in English - Vietnamese, English - English (Wordnet), French - Vietnamese)
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mathematics 1. An ordering of a certain number of elements
of a given set.
For instance, the permutations of (1,2,3) are (1,2,3) (2,3,1)
(3,1,2) (3,2,1) (1,3,2) (2,1,3).
Permutations form one of the canonical examples of a "group"
- they can be composed and you can find an inverse permutation
that reverses the action of any given permutation.