even permutation

noun Mathematics.

a permutation of a set of n elements, x1, x2, … xn, that leaves unchanged the product of all differences of the form (xi — xj), where i is less than j.

Compare odd permutation.

Origin of even permutation

First recorded in 1930–35

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018