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Commit b95c0bc7 authored by Robbert Krebbers's avatar Robbert Krebbers
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Add lemma pure_iff.

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    algebra/upred.v
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    ......@@ -564,6 +564,8 @@ Proof. intros ->; apply iff_refl. Qed.
    Lemma pure_mono φ1 φ2 : (φ1 → φ2) → ■ φ1 ⊢ ■ φ2.
    Proof. intros; apply pure_elim with φ1; eauto using pure_intro. Qed.
    Lemma pure_iff φ1 φ2 : (φ1 ↔ φ2) → ■ φ1 ⊣⊢ ■ φ2.
    Proof. intros [??]; apply (anti_symm _); auto using pure_mono. Qed.
    Lemma and_mono P P' Q Q' : (P ⊢ Q) → (P' ⊢ Q') → P ∧ P' ⊢ Q ∧ Q'.
    Proof. auto. Qed.
    Lemma and_mono_l P P' Q : (P ⊢ Q) → P ∧ P' ⊢ Q ∧ P'.
    ......
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