fact: Definition tilt (i j: 'I_k) (z: 'S_k) := (tperm i j * z)%g.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq path) mathcomp(ssralg fintype perm choice finfun) mathcomp(matrix bigop zmodp mxalgebra fingroup) minor