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Proof step 1 from proof get-last-03 (conclusion)

⊦ (x + a ')[# x] = a

User applied rule insert lemma

And obtained the following new goals

Proof step 2:
⊦ n = # x → (x + a ')[n] = a

Rule argument

spec: list-del inst: name: get-last seq: ⊦ n = # x → (x + a ')[n] = a subst: [n, x, a] → [# x, x, a] flags: current, []

Additional information

Used terms: # x, x, a