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Proof step 3 from proof bag-rem-empty (previous step)

bag -- n = ∅ ⊦ bag = ∅, bag = ∅ ++ n

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ bag = bag2 ↔ (∀ n. count(n, bag) = count(n, bag2))
Proof step 5:
bag -- n = ∅ ⊦ bag = ∅ ++ n, ∀ n. count(n, bag) = count(n, ∅)

Rule argument

spec: bag-basic, inst: nat-bag name: extension seq: ⊦ bag = bag2 ↔ (∀ n. count(n, bag) = count(n, bag2)) subst: [bag2, bag] → [∅, bag] flags: <all paths>

Additional information

Used terms: ∅, bag