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Proof step 9 from proof last-app (previous step)

⊦ str1 = "", (s→l(str0) + s→l(str1)).last = s→l(str1).last

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 10:
⊦ chars ≠ [] → (chars0 + chars).last = chars.last

Rule argument

spec: list-last inst: charlist name: lapp seq: ⊦ chars ≠ [] → (chars0 + chars).last = chars.last subst: [chars, chars0] → [s→l(str1), s→l(str0)] flags: rewrite

Additional information

Used simplifier rules: ⊦ s→l(str) = [] ↔ str = ""; Used terms: s→l(str1), s→l(str0)