zfc로 표현불가능이 알려져있다 카더라
https://math.stackexchange.com/questions/6501/is-there-a-known-well-ordering-of-the-reals이거참조
zfc로 표현불가능이 알려져있다 카더라
https://math.stackexchange.com/questions/6501/is-there-a-known-well-ordering-of-the-reals
이거참조