Library Coq.setoid_ring.NArithRing


Require Export Ring.
Require Import BinPos BinNat.
Import InitialRing.


Ltac Ncst t :=
  match isNcst t with
    true => t
  | _ => constr:NotConstant
  end.

Add Ring Nr : Nth (decidable Neq_bool_ok, constants [Ncst]).