proposition: Lemma irr_comp'_op0 j A : j != iG -> (A \in 'R_j)%MS -> gring_op rG A = 0.
proof: Proof. by rewrite eq_sym; apply: not_rsim_op0 rsim_irr_comp. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq path) mathcomp(div choice fintype tuple finfun bigop prime) mathcomp(ssralg poly polydiv finset fingroup morphism) mathcomp(perm automorphism quotient finalg action zmodp) mathcomp(commutator cyclic center pgroup matrix mxalgebra) mathcomp(mxpoly)