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Proof step 1 from proof notinf-fin (conclusion)

⊦ n∞ ≠ ∞ ↔ (∃ n. n∞ = ⌜n⌝ )

User applied rule constructor cut

And closed the goal!

Rule argument

var: n∞

Additional information

Used simplifier rules: gen: ⊦ ;%disj: ⊦ ⌜m⌝ ≠ ∞;%disj: ⊦ ⌜m⌝ ≠ ∞;%inj: ⊦ ⌜m⌝ = ⌜m0⌝ ↔ m = m0;