Fact algC_invaut_is_rmorphism nu : rmorphism (algC_invaut nu).Canonical algC_invaut_additive nu := Additive (algC_invaut_is_rmorphism nu).Canonical algC_invaut_rmorphism nu := RMorphism (algC_invaut_is_rmorphism nu).

Lemma minCpoly_aut nu x : minCpoly (nu x) = minCpoly x.