End Even_Odd.
Section Zpower.

(* Specifications: *)
Theorem Zpower_plus :
forall n k1 k2, (0 <= k1)%Z -> (0 <= k2)%Z ->
Zpower n (k1 + k2) = (Zpower n k1 * Zpower n k2)%Z.
Theorem Zpower_Zpower_nat :
forall b e, (0 <= e)%Z ->
Zpower b e = Zpower_nat b (Zabs_nat e).
Theorem Zpower_nat_S :
forall b e,
Zpower_nat b (S e) = (b * Zpower_nat b e)%Z.
Theorem Zpower_pos_gt_0 :
forall b p, (0 < b)%Z ->
(0 < Zpower_pos b p)%Z.
Theorem Zeven_Zpower :
forall b e, (0 < e)%Z ->
Zeven (Zpower b e) = Zeven b.
Theorem Zeven_Zpower_odd :
forall b e, (0 <= e)%Z -> Zeven b = false ->
Zeven (Zpower b e) = false.