  Having said that, it is not clear how serious the boundary problem is for naturalists. Perhaps they can argue that there is a fairly sharp boundary, though one that is hard to define. Perhaps mathematicians implicitly know when something counts as a piece of mathematics and when it is a non-mathematical commentary on mathematics. In any case, naturalism seems to survive the absence of a sharp boundary. Naturalism can apparently rest its claims on a set of standards with fuzzy boundaries.