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_4. ~T_1(a_11). s_4 or p. forall y_1: T_1(y_1) <-> R_2(y_1).
p can be inferred via the disjunctive syllogism rule. ~s_4 and ~T_1(a_11) can be inferred via the conjunction rule. ~T_1(a_11) and ~s_4 can be inferred via the conjunction rule. forall y_1: T_1(y_1) -> R_2(y_1) can be inferred via the universal biconditional elimination rule. forall y_1: R_2(y_1) -> T_1(y_1) can be inferred via the universal biconditional elimination rule.