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Proof step 1 from proof to-appfin (conclusion)

⊦ ⌜x⌝ + ⌜y⌝ to n = ⌜x + y to n⌝

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: stream inst: name: append-finfin seq: ⊦ ⌜x + y⌝ = ⌜x⌝ + ⌜y⌝ subst: [y, x] → [y, x] flags: rewrite, current

Additional information

Used terms: y, x