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Commit 82b3e17d authored by Ralf Jung's avatar Ralf Jung
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1 merge request!81add inverses of bool_decide_{true,false}
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......@@ -126,7 +126,7 @@ Lemma bool_decide_false_2 P `{!Decision P}: bool_decide P = false → ¬P.
Proof.
intros Heq HP. assert (HP': bool_decide P).
{ apply bool_decide_spec. assumption. }
destruct (bool_decide P). discriminate. contradiction.
case_bool_decide; auto || discriminate.
Qed.
(** * Decidable Sigma types *)
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