even permutation

WordReference Random House Unabridged Dictionary of American English © 2026

e′ven permuta′tion, [Math.]

1. Mathematics a permutation of a set of n elements, x₁, x₂, … x_n, that leaves unchanged the product of all differences of the form (x_i — x_j), where i is less than j. Cf. odd permutation.

• 1930–35