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Proof step 54 from proof leninv-inf (previous step)

# nσ = ⌜n⌝ , stutf(nσ), (∀ n. ∃ n0. n < n0 ∧ (∃ m. ⌜m⌝ < # nσ ∧ nσ[m] = n0 - 1)) ∨ (∀ n. ¬(n ≠ 0 → (∃ m. ⌜m⌝ < # nσ ∧ nσ[m] = n - 1))) ⊦

User applied rule case distinction

And obtained the following new goals

Proof step 55:
# nσ = ⌜n⌝ , stutf(nσ), ∀ n. ∃ n0. n < n0 ∧ (∃ m. ⌜m⌝ < # nσ ∧ nσ[m] = n0 - 1) ⊦
Proof step 63:
# nσ = ⌜n⌝ , stutf(nσ), ∀ n. ¬(n ≠ 0 → (∃ m. ⌜m⌝ < # nσ ∧ nσ[m] = n - 1)) ⊦

Rule argument

pos: left 3

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