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Proof step 3 from proof add-assoc (previous step)

⊦ (∞ + n∞1) + ⌜m⌝ = ∞ + n∞1 + ⌜m⌝

User applied rule structural induction

And obtained the following new goals

Proof step 4:
⊦ (∞ + ⌜m0⌝ ) + ⌜m⌝ = ∞ + ⌜m0⌝ + ⌜m⌝

Rule argument

indvar: n∞1

Additional information

Used simplifier rules: gen: ⊦ ;%add-inf: ⊦ ∞ + ∞ = ∞;%add-inf1: ⊦ ∞ + ⌜m⌝ = ∞;