Yes it does, when that calculus is over physical units. "Existence" has a different meaning in mathematics than in physics, but you know that, right? Yes, but real numbers are attached to physical units, so what's calculus about when we do that? Mathematical physics makes physical claims though, about what physics is. It claims there are things called Kilograms and Coulombs, for instance, something mathematics by itself doesn't. I don't see that I made any such claim. I said they make it hard to accept the existence of actual points, except as the boundaries of an interval (of measurement). Can you point to the metaphysical argument in there, please?