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Proof step 22 from proof infinite-append-prefixnextli (previous step)

ii(0) = 0, lf(0) = [], (finp(σ) ⊃ # σ = ⌜ii(n)⌝ ∧ (∀ m. n ≤ m → nextli0(lf(m)) = [] ∧ ii(m) = ii(n));∀ n. ∃ m. ii(m) ≤ n ∧ n < ii(m + 1)), ∀ n0. lf(n0) = (σ to ii(n0)).l, ∀ n. ii(n + 1) = ii(n) + # nextli0(lf(n)) ∧ ¬ # σ < ⌜ii(n + 1)⌝ ∧ (σ from ii(n)) to # nextli0(lf(n)) = ⌜nextli0(lf(n))⌝ , ∀ m, n. m ≤ n → ii(m) ≤ ii(n), ∀ n. lf(n + 1) = nextli(lf(n)), ∀ x. nextli(x) = x + nextli0(x) ⊦ (# σ = ⌜ii(n0)⌝ ⊃ ii(n0) = ii(n0 + 1);ii(n0) < ii(n0 + 1))

User applied rule case distinction

And obtained the following new goals

Rule argument

pos: right 1

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