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Proof step 3 from proof restn-at (previous step)

m + n < #(a + x0), ∀ m, n. m + n < # x0 → restn(m, x0)[n] = x0[m + n] ⊦ restn(m, a + x0)[n] = (a + x0)[m + n]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
m + n ≤ # x0, ∀ m, n. m + n < # x0 → restn(m, x0)[n] = x0[m + n] ⊦ restn(m, a ' + x0)[n] = (a ' + x0)[m + n]

Rule argument

Additional information

Used simplifier rules: ⊦ m < n ↔ ¬ n ≤ m; (ss)%c: ⊦ m + n = n + m; from specification nat-basic%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic% ⊦ m < n + 1 ↔ ¬ n < m; (s)%a: ⊦ (x + y) + z = x + y + z; from specification list% ⊦ # a ' = 0 +1; (s)% ⊦ #(x + y) = # x + # y; (s)% ⊦ a + x = a ' + x; (s)