Yes, that's true -- math is not a physical science in that sense. Though as another poster pointed out, theoretical physics is not so different from mathematic

Yes, that's true -- math is not a physical science in that sense. Though as another poster pointed out, theoretical physics is not so different from mathematics in this way, so perhaps the distinction is more between experimenters and theorists. (However, I've no idea what life is like for theoretical computer scientists without any kind of external funding support.)