Commit 8f4fe3de by Robbert Krebbers

### More multiset stuff.

parent ed15664a
 ... ... @@ -301,20 +301,28 @@ Qed. Lemma gmultiset_union_subset_r X Y : X ≠ ∅ → Y ⊂ X ∪ Y. Proof. rewrite (comm_L (∪)). apply gmultiset_union_subset_l. Qed. Lemma gmultiset_elem_of_subseteq x X : x ∈ X → {[ x ]} ⊆ X. Lemma gmultiset_elem_of_singleton_subseteq x X : x ∈ X ↔ {[ x ]} ⊆ X. Proof. rewrite elem_of_multiplicity. intros Hx y; destruct (decide (x = y)) as [->|]. - rewrite multiplicity_singleton; omega. - rewrite multiplicity_singleton_ne by done; omega. rewrite elem_of_multiplicity. split. - intros Hx y; destruct (decide (x = y)) as [->|]. + rewrite multiplicity_singleton; omega. + rewrite multiplicity_singleton_ne by done; omega. - intros Hx. generalize (Hx x). rewrite multiplicity_singleton. omega. Qed. Lemma gmultiset_elem_of_subseteq X1 X2 x : x ∈ X1 → X1 ⊆ X2 → x ∈ X2. Proof. rewrite !gmultiset_elem_of_singleton_subseteq. by intros ->. Qed. Lemma gmultiset_union_difference X Y : X ⊆ Y → Y = X ∪ Y ∖ X. Proof. intros HXY. apply gmultiset_eq; intros x; specialize (HXY x). rewrite multiplicity_union, multiplicity_difference; omega. Qed. Lemma gmultiset_union_difference' x Y : x ∈ Y → Y = {[ x ]} ∪ Y ∖ {[ x ]}. Proof. auto using gmultiset_union_difference, gmultiset_elem_of_subseteq. Qed. Proof. intros. by apply gmultiset_union_difference, gmultiset_elem_of_singleton_subseteq. Qed. Lemma gmultiset_size_difference X Y : Y ⊆ X → size (X ∖ Y) = size X - size Y. Proof. ... ... @@ -364,7 +372,7 @@ Proof. intros Hemp Hinsert X. induction (gmultiset_wf X) as [X _ IH]. destruct (gmultiset_choose_or_empty X) as [[x Hx]| ->]; auto. rewrite (gmultiset_union_difference' x X) by done. apply Hinsert, IH, gmultiset_difference_subset; auto using gmultiset_elem_of_subseteq, gmultiset_non_empty_singleton. apply Hinsert, IH, gmultiset_difference_subset, gmultiset_elem_of_singleton_subseteq; auto using gmultiset_non_empty_singleton. Qed. End lemmas.
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