| reachable-n(H, m, r, r0), ∀ n0. reachable-n(H, m + n0 * n, r, r0) ⊦ n = 0, reachable-n(H, m + n, r, r0) |
[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ m + n = n + m], [CSIMPSEQ : ⊦ m0 * 1 = m0], [CSIMPSEQ : ⊦ m0 * m * n = (m0 * m) * n], [CSIMPSEQ : ⊦ m * n = n * m])], [EXTRATERMS : (1)]]