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. forall x_20: R_20(x_20) and S_20(x_20). s <-> p_1.
s -> p_1 can be inferred via the biconditional elimination rule. p_1 -> s can be inferred via the biconditional elimination rule. ~s can be inferred via the biconditional elimination rule. forall x_20: R_20(x_20) can be inferred via the universal simplification rule. forall x_20: S_20(x_20) can be inferred via the universal simplification rule.