Consider the following premises. forall y: ~Q(y). p <-> Q(e). q_15 -> S_23(a_23). R_23(a_23) or q_15. forall x_23: R_23(x_23) -> S_23(x_23). Can we infer p from them? If possible, name the inference rules being used at each step.
 From forall y: ~Q(y) we can infer ~Q(e) via universal instantiation. From forall x_23: R_23(x_23) -> S_23(x_23) we can infer R_23(a_23) -> S_23(a_23) via universal instantiation. From R_23(a_23) -> S_23(a_23), q_15 -> S_23(a_23), R_23(a_23) or q_15 we can infer S_23(a_23) via disjunction elimination. Finally, from p <-> Q(e), ~Q(e) we can infer ~p via biconditional elimination, which contradicts p. Therefore, the answer is no.