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Require Export NumPrelude.
Require Export NZAxioms.
Set Implicit Arguments.
Module Type ZAxiomsSig.
Declare Module Export NZOrdAxiomsMod : NZOrdAxiomsSig.
Open Local Scope NatIntScope.
Notation Z := NZ (only parsing).
Notation E := NZE (only parsing).
Parameter Zopp : Z -> Z.
Add Morphism Zopp with signature E ==> E as Zopp_wd.
Notation "- x" := (Zopp x) (at level 35, right associativity) : NatIntScope.
(* Integers are obtained by postulating that every number has a predecessor *)
Axiom Zsucc_pred : forall n : Z, S (P n) == n.
Axiom Zopp_0 : - 0 == 0.
Axiom Zopp_succ : forall n : Z, - (S n) == P (- n).
End ZAxiomsSig.
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