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 make_rmap'': forall n (f: AV.address -> resource) , AV.valid (fun l => res_option (f l)) -> exists phi:rmap, level phi = n /\ resource_at phi = resource_fmap (approx n) oo f.