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: s_1 <-> S_7(i). ~R_7(i). forall x_7: R_7(x_7) <-> S_7(x_7).
s_1 -> S_7(i) can be inferred via the biconditional elimination rule. S_7(i) -> s_1 can be inferred via the biconditional elimination rule. forall x_7: R_7(x_7) -> S_7(x_7) can be inferred via the universal biconditional elimination rule. forall x_7: S_7(x_7) -> R_7(x_7) can be inferred via the universal biconditional elimination rule.