Unimodular lattice
Integral lattice of determinant 1 or −1 / From Wikipedia, the free encyclopedia
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Not to be confused with modular lattice.
In geometry and mathematical group theory, a unimodular lattice is an integral lattice of determinant 1 or −1. For a lattice in n-dimensional Euclidean space, this is equivalent to requiring that the volume of any fundamental domain for the lattice be 1.
The E8 lattice and the Leech lattice are two famous examples.