Minkowski-Hlawka Theorem
There exist lattices in 
-D having Hypersphere Packing densities satisfying
where
is the Riemann Zeta Function. However, the proof of this theorem is nonconstructive and it is stillnot known how to actually construct packings that are this dense.See also Hermite Constants, Hypersphere Packing
References
Conway, J. H. and Sloane, N. J. A. Sphere Packings, Lattices, and Groups, 2nd ed. New York: Springer-Verlag, pp. 14-16, 1993.
- Radian
- Radiant Point
- Radical
- Radical Axis
- Radical Center
- Radical Integer
- Radical Line
- Radicand
- Radius
- Radius (Graph)
- Radius of Convergence
- Radius of Curvature
- Radius of Gyration
- Radius of Torsion
- Radius Vector
- Radix
- Radon-Nikodym Theorem
- Radon Transform
- Radon Transform--Cylinder
- Radon Transform--Delta Function
- Radon Transform--Gaussian
- Radon Transform--Square
- Rado's Sigma Function
- Railroad Track Problem
- Ramanujan 6-10-8 Identity