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(a_12) -> p. p -> R_1(a_12). forall y: P(y) <-> R_1(y).
P(a_12) -> R_1(a_12) can be inferred via the transitivity rule. forall y: P(y) -> R_1(y) can be inferred via the universal biconditional elimination rule. forall y: R_1(y) -> P(y) can be inferred via the universal biconditional elimination rule.