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Proof step 1 from proof contractinf-tl (conclusion)

⊦ ⌜nf(0) '⌝ + tl(⌜nf⌝ ) = ⌜nf⌝

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ ⌜nf(0) '⌝ + ⌜λ n. nf(n + 1)⌝ = ⌜nf⌝

Rule argument

Additional information

Used simplifier rules: tl-inf: ⊦ tl(⌜nf⌝ ) = ⌜λ n. nf(n +1)⌝ ;% ⊦ m +1 = m + 1; (s)