Root Lattice
The root lattice of En has determinant 9−n, and can be constructed as the lattice of vectors in the unimodular Lorentzian lattice Zn,1 that are orthogonal to the vector (1,1,1,1,....,1|3) of norm n×12 − 32 = n − 9.
Read more about this topic: En (Lie Algebra)
Famous quotes containing the word root:
“Under an oak, whose antique root peeps out
Upon the brook that brawls along this wood.”
—William Shakespeare (1564–1616)