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Proof step 10 from proof prefix-num (previous step)

⊦ char ' + str1 = "", char ' + str2 = "", s→l(str1) ⊑ s→l(str2) ↔ str1 ⊑ str2

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: inst: name: prefix-def seq: ⊦ str ⊑ str0 ↔ s→l(str) ⊑ s→l(str0) subst: [str0, str] → [str2, str1] flags: rewrite, current

Additional information

Used terms: str2, str1