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math.NT1999
Classification of positive definite lattices
R. E. Borcherds
In this paper we describe an algorithm for classifying orbits of vectors in Lorentzian lattices. The main point of this is that isomorphism classes of positive definite lattices in…
math.NT1999
The Leech lattice and other lattices
R. E. Borcherds
This is an unpublished manuscript written in 1983-4. It contains several results about lattices (=integral quadratic forms) including the classification of the unimodular lattices…