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_5 and u_1. forall y_4: ~P(y_4). t <-> P(e).
p_5 can be inferred via the simplification rule. u_1 can be inferred via the simplification rule. t -> P(e) can be inferred via the biconditional elimination rule. P(e) -> t can be inferred via the biconditional elimination rule.