Consider the following premises. forall x_2: P_1(x_2) or P(x_2). P(j) -> r_6. P_1(j) -> r_6. Can we infer forall x_2: P_1(x_2) or P(x_2) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.