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Proof step 4 from proof cons-extract-list (previous step)

⊦ (⌜a '⌝ + ⌜x⌝ ).l = a ' + x

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ ⌜x + y⌝ = ⌜x⌝ + ⌜y⌝
Proof step 6:
⊦ ⌜a ' + x⌝ .l = a ' + x

Rule argument

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

Additional information

Used terms: x, a '