0 ≤ i ⊦ i→n(1 + countrefs(ints) * i) = 1 + i→n(countrefs(ints)) * i→n(i)
[[CONCRETESIMPRULES : ([CSIMPFORWARD : ⊦ i ≤ j ∧ 0 ≤ i → 0 ≤ j])]]