proposition: Fact famYinv_subproof ff : (mdeg (famYinv_fun ff) < d.+1)%N.
proof: Proof. rewrite /famYinv_fun /=. case: (ssrnat.ltnP (mdeg [multinom _ | i < _]) d.+1) => //= _. by rewrite mdeg0. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssrint rat ssralg ssrnum algC matrix vector) mathcomp(mpoly) tools partition ordtype antisym Schur_mpoly Schur_altdef sympoly homogsym permcent