Module Type ZPowProp
(Import A : ZAxiomsSig')
(Import B : ZMulOrderProp A)
(Import C : ZParityProp A B)
(Import D : ZSgnAbsProp A B).
Include NZPowProp A A B.
(** A particular case of [pow_add_r], with no precondition *)

Lemma pow_twice_r a b : a^(2*b) == a^b * a^b.