Lattice Theory and Geometry of Numbers (The Geometry Junkyard)
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http://www.ics.uci.edu/~eppstein/junkyard/lattice.html  


David Eppstein, Theory Group, ICS, UC Irvine  
An extensive annotated list of links to material on lattices. A lattice is an infinite arrangement of points spaced with sufficient regularity that one can shift any point onto any other point by some symmetry of the arrangement. More formally, a lattice can be defined as a discrete subgroup of a finitedimensional vector space (the subgroup is often required not to lie within any subspace of the vector space, which can be expressed formally by saying that the quotient of the space by the lattice is compact).  


Levels:  High School (912), College, Research 
Languages:  English 
Resource Types:  Link Listings 
Math Topics:  Order/Lattices, Symmetry/Tessellations 
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