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_1. t_1 <-> t. p_1 -> t_1.
t_1 can be inferred via the modus ponens rule. t_1 -> t can be inferred via the biconditional elimination rule. t -> t_1 can be inferred via the biconditional elimination rule.