Section PrimeCharRing.
Variable R0 : ringType.
Definition PrimeCharType of p \in [char R0] : predArgType := R0.
Hypothesis charRp : p \in [char R0].
Local Notation R := (PrimeCharType charRp).
Implicit Types (a b : 'F_p) (x y : R).
Canonical primeChar_eqType := [eqType of R].
Canonical primeChar_choiceType := [choiceType of R].
Canonical primeChar_zmodType := [zmodType of R].
Canonical primeChar_ringType := [ringType of R].
Definition primeChar_scale a x := a%:R * x.
Local Infix "*p:" := primeChar_scale (at level 40).
Let natrFp n : (inZp n : 'F_p)%:R = n%:R :> R.
Definition primeChar_vectMixin := Vector.Mixin primeChar_vectAxiom.
Canonical primeChar_vectType := VectType 'F_p R primeChar_vectMixin.
Fact galLgen K :
{alpha | generator 'Gal({:L} / K) alpha & forall x, alpha x = x ^+ order K}.

Lemma finField_galois_generator K E :
(K <= E)%VS ->
{alpha | generator 'Gal(E / K) alpha
& {in E, forall x, alpha x = x ^+ order K}}.