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_6. p_6 <-> u. p_6 -> u.
p_6 -> u can be inferred via the biconditional elimination rule. u -> p_6 can be inferred via the biconditional elimination rule. ~u can be inferred via the biconditional elimination rule.