| cyclic(r, H) ⊦ ∃ r0. reachable-n(H, n, r, r0) |
⊦ cyclic(r, H) ↔ (∃ m, r0. reachable-n(H, m, r, r0) ∧ (∃ n. n ≠ 0 ∧ (∀ n0. reachable-n(H, m + n0 * n, r, r0))))
∃ m, r0. reachable-n(H, m, r, r0) ∧ (∃ n. n ≠ 0 ∧ (∀ n0. reachable-n(H, m + n0 * n, r, r0))) ⊦ ∃ r0. reachable-n(H, n, r, r0)
[[CONCRETESIMPRULES : ()], [EXTRATERMS : (H, r)]]