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Proof step 7 from proof Del-empty (previous step)

⊦ (∅ -- str)[str] = (∅)[str], str ∈ ∅ -- str

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: <toplevel> name: read-notin seq: ⊦ ¬ str ∈ sdt → sdt[str] = (∅)[str] subst: [str, sdt] → [str, ∅ -- str] flags: <all paths>

Additional information

Used terms: str, ∅ -- str