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Proof step 5 from proof prefix-append-one-sizeeq (previous step)

# x0 = # x1 + 1, x0 ⊑ x1 + a ' ⊦ x0 = x1 + a '

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: list-last inst: name: prefix seq: ⊦ x ⊑ y ↔ (∃ z. x + z = y) subst: [y, x] → [x1 + a ', x0] flags: rewrite

Additional information

[Concretesimprules(()), Extraterms((x1 + a 'x0))]