i guess the thing i'm disagreeing on relates to a definition of a surface that requires discrete or compositional elements to describe. a point is before a set, a set is a collection of points. a line can be divided, then you can make a set, a set could be said to be all sets of points in a single dimension. you can make that dimension infinite, or you can make it circular, again, the geometry precedes the establishment of a set. a point is the primary unit of topology. so i guess i'm splitting hairs. i just don't agree with the post-hoc nature of sets, being primordial compared to the ad-hoc nature of divisions of surfaces.