| p(c, b), p(a, c0), rtc(n0, c0, c), p(c0, c1), rtc(n0, c1, b), ∀ a, c, b. rtc(n0, a, c) ∧ p(c, b) → (∃ c. p(a, c) ∧ rtc(n0, c, b)) ⊦ p(a, c0) ∧ (∃ c. p(c0, c) ∧ rtc(n0, c, b)), ∃ c1. p(a, c1) ∧ (∃ c. p(c1, c) ∧ rtc(n0, c, b)) |
p(c, b), p(a, c0), rtc(n0, c0, c), p(c0, c1), rtc(n0, c1, b), ∀ a, c, b. rtc(n0, a, c) ∧ p(c, b) → (∃ c. p(a, c) ∧ rtc(n0, c, b)) ⊦ ∃ c1. p(a, c1) ∧ (∃ c. p(c1, c) ∧ rtc(n0, c, b)), ∃ c. p(c0, c) ∧ rtc(n0, c, b)