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Proof step 1 from proof fin-toinf (conclusion)

⊦ finp(σ to∞ n∞) ↔ n∞ ≠ ∞ ∨ finp(σ)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: toinf-inf: ⊦ σ to∞ ∞ = σ;%inf-not-toinf-exceptinf: ⊦ ⌜nf⌝ = σ to∞ n∞ ↔ ¬ ¬(n∞ = ∞ ∧ ⌜nf⌝ = σ);%test-01: ⊦ ¬ finp(⌜nf⌝ ); from specification stream-basic%stream-fin-forward: ⊦ finp(σ) → (∃ x. ⌜x⌝ = σ); (forward) from specification stream-basic%stream-inf-forward: ⊦ ¬ finp(σ) → (∃ nf. ⌜nf⌝ = σ); (forward) from specification stream-basic