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_17 <-> P(a_23). forall y: ~P(y). ~p. p <-> u.
p_17 -> P(a_23) can be inferred via the biconditional elimination rule. p -> u can be inferred via the biconditional elimination rule. P(a_23) -> p_17 can be inferred via the biconditional elimination rule. u -> p can be inferred via the biconditional elimination rule. ~u can be inferred via the biconditional elimination rule.