As I understood it, the purpose was to sharpen the boundary between what would otherwise be relatively fuzzy concepts, by going through the edge cases systematically. The individual facts given are all obvious, but consolidating them into a single crisp distinction is not so obvious and enables that distinction to be used elsewhere.
As I understood it, the purpose was to sharpen the boundary between what would otherwise be relatively fuzzy concepts, by going through the edge cases systematically. The individual facts given are all obvious, but consolidating them into a single crisp distinction is not so obvious and enables that distinction to be used elsewhere.
Yes, thanks—this is more what I had in mind.