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Proof step 1 from proof notinf-eq (conclusion)

⊦ i∞ ≠ ∞ ∧ i∞ ≠ -∞ → ⌜i∞.i⌝ = i∞

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ ⌜i∞.i⌝ = i∞, i∞ = -∞, i∞ = ∞

Rule argument

Additional information