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. 2019