What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: p_5 <-> R_4(d_1). forall x_4: U_4(x_4) -> R_4(x_4). U_4(d_1) or ~R_4(d_1). ~p_5.
R_4(d_1) -> U_4(d_1) can be inferred via the rewriting rule. p_5 -> R_4(d_1) can be inferred via the biconditional elimination rule. R_4(d_1) -> p_5 can be inferred via the biconditional elimination rule. ~R_4(d_1) can be inferred via the biconditional elimination rule.