View source for Sphere packing

====Comments====
Sphere  packing has various applications in error-correcting codes (cf.  [[Error-correcting code|Error-correcting code]]), the channel coding  problem, Steiner systems (cf. [[Steiner system|Steiner system]]),  <img align="absmiddle" border="0"  src="https://www.encyclopediaofmath.org/legacyimages/p/p071/p071050/p07105021.png" />-designs, and in  the theory of finite groups. The most important special case is the  sphere packing in <img align="absmiddle" border="0"  src="https://www.encyclopediaofmath.org/legacyimages/p/p071/p071050/p07105022.png" /> via the [[Leech  lattice|Leech lattice]]. Finite and infinite sphere packing in <img  align="absmiddle" border="0"  src="https://www.encyclopediaofmath.org/legacyimages/p/p071/p071050/p07105023.png" /> has applications  in classical and modern crystallography (cf. [[Crystallography,  mathematical|Crystallography, mathematical]]).
J.H. Conway,   N.J.A. Sloane,   "Sphere packing, lattices and groups" , Springer  (1988)