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Proof step 2 from proof inf-not-to (previous step)

⌜nf⌝ = σ to n ⊦

User applied rule constructor cut

And closed the goal!

Rule argument

var: σ

Additional information

Used simplifier rules: to-fin: ⊦ ⌜x⌝ to n = ⌜x to n⌝ ;%to-inf: ⊦ ⌜nf⌝ to n = ⌜nf to n⌝ ;%stream freely generated by ⌜ ⌝, ⌜ ⌝;;%disj: ⊦ ⌜x⌝ ≠ ⌜nf⌝ ; from specification stream-basic