proposition: Lemma cfRepr_sign2 : cfRepr sign_repr = 'chi_(cast_ord (esym NirrS2) 1).
proof: Proof. Proof using. by rewrite cfRepr_sign sign_char2. Qed.
imports: mathcomp(all_ssreflect) mathcomp(fingroup perm ssralg morphism perm action) mathcomp(zmodp) mathcomp(vector matrix mxalgebra ssrnum algC) mathcomp(mxrepresentation classfun character) permcomp tools partition congr cycles cycletype presentSn