proposition: Lemma rcoset_repr x : G :* (repr (G :* x)) = G :* x.
proof: Proof. exact/rcoset_eqP/mem_repr_rcoset. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype div path tuple bigop prime finset)