in fact that gets used in abstract mathematics to first introduce the natural numbers. the empty set (nothing) (which you define as 0) is not itself nothing, so you can define the set that contains just the empty set, which now is not empty itself, but contains one element, so you define that as 1 …
in fact that gets used in abstract mathematics to first introduce the natural numbers. the empty set (nothing) (which you define as 0) is not itself nothing, so you can define the set that contains just the empty set, which now is not empty itself, but contains one element, so you define that as 1 …