Commit 7c9f06f7 authored by Robbert Krebbers's avatar Robbert Krebbers

Show that non-atomic invariants are closed under logical equivalence.

parent 8f5438b8
......@@ -43,6 +43,14 @@ Section proofs.
Global Instance na_inv_persistent p N P : Persistent (na_inv p N P).
Proof. rewrite /na_inv; apply _. Qed.
Lemma na_inv_iff p N P Q : (P Q) - na_inv p N P - na_inv p N Q.
iIntros "#HPQ". rewrite /na_inv. iDestruct 1 as (i ?) "#Hinv".
iExists i. iSplit; first done. iApply (inv_iff with "[] Hinv").
iNext. iAlways. iSplit; (iIntros "[[? Ho]|?]";
[iLeft; iFrame "Ho"; by iApply "HPQ"|by iRight]).
Lemma na_alloc : (|==> p, na_own p )%I.
Proof. by apply own_alloc. Qed.
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