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Proof step 21 from proof inv-get-lslen (previous step)

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

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Proof step 22:
n1 = m + 1 ∧ n1 ≠ 0, # nσ = ⌜n1⌝ , max∞(λ n0. n0 < n1 ∧ nσ[n0] = n) = ∞, n ≤ nσ[m], stutf(nσ), n1 ≤ ∞.n ⊦

Rule argument

spec: nat inst: name: elim-pred-c seq: n ≠ 0 ⊦ m = n - 1 ↔ n = m + 1 subst: [n, m] → [n1, m] flags:

Additional information

Used simplifier rules: stutf-nonempty: ⊦ stutf(nσ) → (¬ nσ ≠ [] ↔ false);%size-empty-equiv: ⊦ # nσ = ⌜0⌝ ↔ nσ = []; from specification stream[natstream]%n ≠ 0 ⊦ m = n - 1 ↔ n = m + 1; (elim) Used terms: n1, m