Proof step 11 from proof inv-propagate (previous step)
Pelem(a), p(a, c), rtc(n0, c, b), ∀ a, b, Pelem. rtc(n0, a, b) ∧ Pelem(a) ∧ (∀ a, b. Pelem(a) ∧ p(a, b) → Pelem(b)) → Pelem(b),
∀ a, b. Pelem(a) ∧ p(a, b) → Pelem(b)
⊦ Pelem(b), Pelem(c)
Heuristic quantifier closing applied rule all left