This page describes the results of some lattice computations carried out by Arie Peterson, specifically in the lattices E8 and E7. We are are interested in the number of roots that can be orthogonal to lattice vectors of a certain length.




Source code

These are the computer programs used to obtain the above results. They are written in haskell, a lazy functional programming language.

Here is a tarball with all these source files. To compile the programs, you need the Haskell platform, and the following haskell packages (these can be installed using the command "cabal install $package"):

G.K. Sankaran