Hausdorff dimensions of very well intrinsically approximable subsets of quadratic hypersurfaces

We prove an analogue of a theorem of A. Pollington and S. Velani (‘05), furnishing an upper bound on the Hausdorff dimension of certain subsets of the set of very well intrinsically approximable points on a quadratic hypersurface. The proof incorporates the framework of intrinsic approximation on such hypersurfaces first developed in the authors’ joint work with D. Kleinbock (preprint '14) with ideas from work of D. Kleinbock, E. Lindenstrauss, and B. Weiss ('04).