| ⊦ m < # x ∧ n < # x → #oc(a, x[m, x[n]][n, x[m]]) = #oc(a, x) |
n < # x, m < # x ⊦ #oc(a, x[m, x[n]][n, x[m]]) = #oc(a, x), x = []
Used simplifier rules: l: ⊦ # x = 0 ↔ x = []; from specification list-data%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic1