Definition identity_rmap' : R.rmap' := exist valid (fun _: AV.address => R.NO) AV.valid_empty.Definition identity_rmap (n:nat) : rmap := R.squash (n, identity_rmap').

Lemma snd_identity_map : forall n, proj1_sig (snd (R.unsquash (identity_rmap n))) = fun _ => R.NO .