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Proof step 5 from proof subset-emp (previous step)

a ∈ bag, bag ⊆ ∅ ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: <toplevel> name: in seq: ⊦ a ∈ bag ↔ count(a, bag) ≠ 0 subst: [bag, a] → [bag, a] flags: <all paths>

Additional information

Used terms: bag, a