Consider the following premises. p <-> P_14(a_14). forall x_14: P_14(x_14). Can we infer p from them?
 From forall x_14: P_14(x_14) we can infer P_14(a_14). From p <-> P_14(a_14) we can infer P_14(a_14) -> p. Finally, from P_14(a_14) -> p, P_14(a_14) we can infer p. Therefore, the answer is yes.