Module NMulOrderProp (Import N : NAxiomsMiniSig').
Include NAddOrderProp N.
(** Theorems that are either not valid on Z or have different proofs on N and Z *)
Notation mul_pos := lt_0_mul' (only parsing).

Theorem eq_mul_1 : forall n m, n * m == 1 <-> n == 1 /\ m == 1.