proposition: Lemma row_free1 : row_free (1 : 'M[algC]_1).
proof: Proof. by apply/row_freeP; exists 1; rewrite mul1mx. 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