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Proof step 1 from proof get-append3-fin (conclusion)

⊦ (⌜x⌝ + ⌜x0⌝ + ⌜x1⌝ )[m] = (x + x0 + x1)[m]

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ ⌜x + y⌝ = ⌜x⌝ + ⌜y⌝
Proof step 3:
⊦ (⌜x⌝ + ⌜x0 + x1⌝ )[m] = (x + x0 + x1)[m]

Rule argument

spec: stream inst: name: append-finfin seq: ⊦ ⌜x + y⌝ = ⌜x⌝ + ⌜y⌝ subst: [y, x] → [x1, x0] flags: rewrite, current

Additional information

Used terms: x1, x0