Commit 034bdcad authored by Johannes Kloos's avatar Johannes Kloos

Renamed subset_difference_in and moved to collection

parent 01f94618
......@@ -620,6 +620,9 @@ Section collection.
Proof. set_solver. Qed.
Lemma difference_disjoint X Y : X ## Y X Y X.
Proof. set_solver. Qed.
Lemma subset_difference_elem_of {x: A} {s: C} (inx: x s): s {[ x ]} s.
Proof. set_solver. Qed.
Lemma difference_mono X1 X2 Y1 Y2 :
X1 X2 Y2 Y1 X1 Y1 X2 Y2.
......
......@@ -27,13 +27,10 @@ Qed.
Section Fresh.
Context `{FinCollection A C} `{Infinite A, !RelDecision (@elem_of A C _)}.
Lemma subset_difference_in {x: A} {s: C} (inx: x s): s {[ x ]} s.
Proof. set_solver. Qed.
Definition fresh_generic_body (s: C) (rec: s', s' s nat A) (n: nat) :=
let cand := inject n in
match decide (cand s) with
| left H => rec _ (subset_difference_in H) (S n)
| left H => rec _ (subset_difference_elem_of H) (S n)
| right _ => cand
end.
Lemma fresh_generic_body_proper s (f g: y, y s nat A):
......@@ -64,7 +61,7 @@ Section Fresh.
induction s as [s IH] using (well_founded_ind collection_wf); intro.
setoid_rewrite fresh_generic_fixpoint_unfold; unfold fresh_generic_body.
destruct decide as [case|case]; eauto with omega.
destruct (IH _ (subset_difference_in case) (S n)) as [m [mbound [eqfix [notin inbelow]]]].
destruct (IH _ (subset_difference_elem_of case) (S n)) as [m [mbound [eqfix [notin inbelow]]]].
exists m; repeat split; auto with omega.
- rewrite not_elem_of_difference, elem_of_singleton in notin.
destruct notin as [?|?%inject_injective]; auto with omega.
......
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