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Proof step 23 from proof inv-get-lslen (previous step)

# nσ = ⌜m⌝ + ⌜1⌝ , max∞(λ n0. ¬ m < n0 ∧ nσ[n0] = n) = ∞, n ≤ nσ[m], stutf(nσ), m < ∞.n ⊦ ∞.n = 0

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 24:
⊦ max∞(np) = ∞ ↔ (∀ n. ∃ n0. n < n0 ∧ np(n0)) ∨ (∀ n. ¬ np(n))
Proof step 25:
# nσ = ⌜m⌝ + ⌜1⌝ , (∀ n0. ∃ n1. n0 < n1 ∧ ¬ m < n1 ∧ nσ[n1] = n) ∨ (∀ n0. ¬(¬ m < n0 ∧ nσ[n0] = n)), n ≤ nσ[m], stutf(nσ), m < ∞.n ⊦ ∞.n = 0

Rule argument

spec: inst: name: maxinf-inf seq: ⊦ max∞(np) = ∞ ↔ (∀ n. ∃ n0. n < n0 ∧ np(n0)) ∨ (∀ n. ¬ np(n)) subst: [np] → [λ n0. ¬ m < n0 ∧ nσ[n0] = n] flags: rewrite, current

Additional information

Used terms: λ n0. ¬ m < n0 ∧ nσ[n0] = n