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Proof step 1 from proof stream-inf-forward (conclusion)

⊦ ¬ finp(σ) → (∃ nf. ⌜nf⌝ = σ)

User applied rule structural induction

And closed the goal!

Rule argument

indvar: σ

Additional information

Used simplifier rules: gen: ⊦ ;%test-02: ⊦ finp(⌜x⌝ );%test-01: ⊦ ¬ finp(⌜nf⌝ );%inj-01: ⊦ ⌜nf⌝ = ⌜nf0⌝ ↔ nf = nf0;