I would assume that what he wants is a physics textbook that assumes that you're very fluent in math (not a book about handwaving), thus making the presentation a lot more dense, thus faster... I'm myself a Ph.D. student in math and I've tried to find such a book myself. It's very booring to read physics books that really do calculations the hard way (e.g. use pages to do something with matrices that directly follows from a theorem concerning linear operators etc.). Unfortunately, I don't think such books exists...