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Proof step 1 from proof add-assoc (conclusion)

⊦ (n∞ + n∞1) + n∞2 = n∞ + n∞1 + n∞2

Heuristic structural induction applied rule structural induction

And obtained the following new goals

Proof step 2:
⊦ (n∞ + n∞1) + ⌜m⌝ = n∞ + n∞1 + ⌜m⌝

Rule argument

term: n∞2

Additional information

Used simplifier rules: gen: ⊦ ;%add-all-inf: ⊦ n∞ + ∞ = ∞;