if it can be shown that you normatively should worry only about the real world,
It can’t be. Not in any system of norms I would give a fig about. Art, Fiction, and Math are worthwhile. They don’t have to be useful. If you disagree with that, then we simply have different utility functions, and there’s no point in arguing further.
You are seeing “useful” too narrowly. I only stated that whatever you consider “useful”, it’s probably a statement exclusively about the real world, and “doing math” is one of the activities in the real world. I don’t see how you could place Art in the same cached thought, since it was remarked many times that you shouldn’t go Spock.
It can’t be. Not in any system of norms I would give a fig about. Art, Fiction, and Math are worthwhile. They don’t have to be useful. If you disagree with that, then we simply have different utility functions, and there’s no point in arguing further.
You are seeing “useful” too narrowly. I only stated that whatever you consider “useful”, it’s probably a statement exclusively about the real world, and “doing math” is one of the activities in the real world. I don’t see how you could place Art in the same cached thought, since it was remarked many times that you shouldn’t go Spock.