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Proof step 2 from proof notinf-eq (previous step)

⊦ ⌜i∞.i⌝ = i∞, i∞ = -∞, i∞ = ∞

Heuristic structural induction applied rule structural induction

And closed the goal!

Rule argument

term: i∞

Additional information

Used simplifier rules: gen: ⊦ ;%sel: ⊦ ⌜i⌝ .i = i;%inj: ⊦ ⌜i⌝ = ⌜i0⌝ ↔ i = i0;