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Proof step 2 from proof butlast-last (previous step)

⊦ x.butlast + x.last ' = x, x = []

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ x + a = x + a '
Proof step 4:
⊦ x.butlast + x.last = x, x = []

Rule argument

spec: list inst: name: Last seq: ⊦ x + a = x + a ' subst: [a, x] → [x.last, x.butlast] flags: rewrite

Additional information

Used terms: x.last, x.butlast