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odd permutation

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noun Mathematics.
  1. a permutation of a set of n elements, x1, x2, …, xn, which permutes the product of all differences of the form (xixj), where i is less than j, into the negative of the product.
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Origin of odd permutation

First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018