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Proof step 17 from proof subarray-copy (previous step)

n < m1, n + m0 < # ar1, m0 + m1 ≤ # ar1 ⊦ (n < n3 ∨ n3 + n2 ≤ n ⊃ ar1[n + m0];ar0[n + n0 - n3]) = (n < n3 ∨ n3 + n2 ≤ n ⊃ copy(ar1, m0, mkarray(m1), 0, m1)[n];ar0[n + n0 - n3])

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 18:
⊦ m0 < # ar1 → copy(ar0, n, ar1, n0, m)[m0] = (m0 < n0 ∨ n0 + m ≤ m0 ⊃ ar1[m0];ar0[m0 + n - n0])

Rule argument

spec: <toplevel> name: at-copy seq: ⊦ m0 < # ar1 → copy(ar0, n, ar1, n0, m)[m0] = (m0 < n0 ∨ n0 + m ≤ m0 ⊃ ar1[m0];ar0[m0 + n - n0]) subst: [m0, m, n0, ar1, n, ar0] → [n, m1, 0, mkarray(m1), m0, ar1] flags: <all paths>

Additional information

Used simplifier rules: ⊦ ¬ m < 0; (s)% ⊦ n + 0 = n; (s)%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic%c: ⊦ m + n = n + m; from specification nat-basic% ⊦ m < n → (n ≤ m ↔ false); (s)% ⊦ m - 0 = m; (s)% ⊦ # mkarray(n) = n; (s)% ⊦ m < n ↔ ¬ n ≤ m; (ss) Used terms: n, m1, 0, mkarray(m1), m0, ar1