an inquiry concerning a quantifiable building of a set
In a 2 - d aircraft, allow $A$ be the set of all factors inside a circle $C$ and also $P$ be the set of all factors on the border of the circle $C$. Exists any kind of generalised action in set concept which compares 2 such collections?
The location of A declares, while the location of P is absolutely no. Did you suggest to compare the inside of the circle and also the closure of that set (i. e. the union of the border and also the inside)?