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edited title

edited Aug 5, 2013 at 22:22

A description of the isometry group $O(U\oplus E_8)$?

Are there any good description of the isometry group $O(U\oplus E_8)$? Here $U$ denotes the hyperbolic lattice and $E_8$ the root lattice of type $E_8$.

lattices quadratic-forms

asked Aug 5, 2013 at 22:12

Andrew