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: q_12. forall x_17: R_17(x_17) <-> S_17(x_17). S_17(i) or ~q_12.
q_12 -> S_17(i) can be inferred via the rewriting rule. forall x_17: R_17(x_17) -> S_17(x_17) can be inferred via the universal biconditional elimination rule. forall x_17: S_17(x_17) -> R_17(x_17) can be inferred via the universal biconditional elimination rule.