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Proof step 19 from proof range-copy-outer (previous step)

range=(ar2, n2, ar, n + n3, m1), n3 + m1 ≤ m0, (n3 + n0) + m1 ≤ # ar0, n0 + m0 ≤ # ar0, n + m0 ≤ # ar ⊦ n2 + m1 ≤ # ar2 ∧ (n1 < m1 → ar2[n2 + n1] = copy(ar, n, ar0, n0, m0)[(n3 + n0) + n1])

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 20:
⊦ range=(ar0, n0, ar1, n1, m) ↔ n0 + m ≤ # ar0 ∧ n1 + m ≤ # ar1 ∧ (∀ n. n < m → ar0[n0 + n] = ar1[n1 + n])
Proof step 21:
n + m0 ≤ # ar, n0 + m0 ≤ # ar0, (n3 + n0) + m1 ≤ # ar0, n3 + m1 ≤ m0, n2 + m1 ≤ # ar2, (n + n3) + m1 ≤ # ar, ∀ n4. n4 < m1 → ar2[n2 + n4] = ar[(n + n3) + n4] ⊦ n2 + m1 ≤ # ar2 ∧ (n1 < m1 → ar2[n2 + n1] = copy(ar, n, ar0, n0, m0)[(n3 + n0) + n1])

Rule argument

spec: <toplevel> name: range-eq-ext seq: ⊦ range=(ar0, n0, ar1, n1, m) ↔ n0 + m ≤ # ar0 ∧ n1 + m ≤ # ar1 ∧ (∀ n. n < m → ar0[n0 + n] = ar1[n1 + n]) subst: [m, n1, ar1, n0, ar0] → [m1, n + n3, ar, n2, ar2] flags: <all paths>

Additional information

Used terms: m1, n + n3, ar, n2, ar2