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: forall x_15: Q_15(x_15) <-> Q_8(x_15). forall x_15: ~P_15(x_15). forall x_15: P_15(x_15) or ~Q_15(x_15). Q_8(a_5) <-> u_3.
Q_8(a_5) -> u_3 can be inferred via the biconditional elimination rule. u_3 -> Q_8(a_5) can be inferred via the biconditional elimination rule. forall x_15: Q_15(x_15) -> P_15(x_15) can be inferred via the universal rewriting rule. forall x_15: Q_15(x_15) -> Q_8(x_15) can be inferred via the universal biconditional elimination rule. forall x_15: Q_8(x_15) -> Q_15(x_15) can be inferred via the universal biconditional elimination rule.