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_13(a_12) or ~r_1. forall x_13: T(x_13) -> Q_13(x_13). T(a_12) or r_1. forall x_13: Q_13(x_13) -> T(x_13).
r_1 -> Q_13(a_12) can be inferred via the rewriting rule. forall x_13: T(x_13) <-> Q_13(x_13) can be inferred via the universal biconditional introduction rule. forall x_13: Q_13(x_13) <-> T(x_13) can be inferred via the universal biconditional introduction rule.