parent 556a5992
......@@ -401,7 +401,7 @@ Section infinite.
(** Properties about the [fresh] operation on finite sets *)
Global Instance fresh_proper: Proper ((@{C}) ==> (=)) fresh.
Proof. unfold fresh, set_fresh. solve_proper. Qed.
Proof. unfold fresh, set_fresh. Morphisms.solve_proper. Qed.
Lemma is_fresh X : fresh X X.
Proof.
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