Consider the following premises. ~Q_17(a_14). forall x_17: P_17(x_17) <-> Q_17(x_17). Can we infer ~P_17(a_14) or s from them?
 From forall x_17: P_17(x_17) <-> Q_17(x_17) we can infer forall x_17: P_17(x_17) -> Q_17(x_17). From forall x_17: P_17(x_17) -> Q_17(x_17) we can infer P_17(a_14) -> Q_17(a_14). From P_17(a_14) -> Q_17(a_14), ~Q_17(a_14) we can infer ~P_17(a_14). Finally, from ~P_17(a_14) we can infer ~P_17(a_14) or s. Therefore, the answer is yes.