Consider the following premises. forall x_17: P_17(x_17) <-> Q(x_17). r_1 <-> Q(h). forall x_17: ~P_17(x_17). Can we infer ~r_1 or u from them?
 From forall x_17: P_17(x_17) <-> Q(x_17), forall x_17: ~P_17(x_17) we can infer forall x_17: ~Q(x_17). From forall x_17: ~Q(x_17) we can infer ~Q(h). From r_1 <-> Q(h), ~Q(h) we can infer ~r_1. Finally, from ~r_1 we can infer ~r_1 or u. Therefore, the answer is yes.