Algebraically Integrable Smooth Convex Bodies

We prove that a convex body with $C^{\mathrm{\infty }}$ boundary in an odd dimension $n\ge 3$ is algebraically integrable if and only if it is an ellipsoid. This answers Arnold’s problem for smooth convex bodies. Together with Vassiliev’s even-dimensional nonexistence theorem, it gives the classification in every dimension $n\ge 2$. More generally, in odd dimensions, a convex body with $C^{\mathrm{\infty }}$ semialgebraic boundary is an ellipsoid whenever its section volume function satisfies a joint algebraic relation.