Consider the following premises. forall y_1: W_2(y_1). forall y_1: W_2(y_1) -> W_4(y_1). Can we infer forall y_1: W_4(y_1) from them? If possible, name the inference rules being used at each step.
We can infer forall y_1: W_4(y_1) via the universal modus ponens rule. Therefore, the answer is yes.