Consider the following premises. t <-> Q_13(a_12). ~t. forall x_13: P_13(x_13) -> Q_13(x_13). forall x_13: Q_13(x_13) -> P_13(x_13). Can we infer ~q from them? If possible, name the inference rules being used at each step.
We cannot infer that from the premises. Therefore the answer is no.