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Proof step 19 from proof inv-get-lslen (previous step)

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

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Proof step 20:
# nσ = ⌜n1⌝ , max∞(λ n0. ⌜n0⌝ < # nσ ∧ nσ[n0] = n) = ∞, stutf(nσ), n ≤ nσ[n1 - 1] ⊦ # nσ = ∞, ⌜∞.n⌝ < # nσ

Rule argument

spec: nat-inf-basic inst: name: elim seq: ⊦ n∞ ≠ ∞ → (n = n∞.n ↔ n∞ = ⌜n⌝ ) subst: [n∞, m] → [# nσ, m] flags:

Additional information

Used simplifier rules: ⊦ n∞ ≠ ∞ → (n = n∞.n ↔ n∞ = ⌜n⌝ ); (elim) Used terms: # nσ, m