proposition: Lemma cast_IirrS2 (i : Iirr 'SG_2) : i != 0 -> i = cast_ord (esym NirrS2) 1.
proof: Proof. Proof using. move=> Hi; apply val_inj => /=. by case: i Hi => [[|[|i]]] //=; rewrite NirrS2. 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