2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/79476This is an unpublished manuscript written in 1983-4. It contains several results about lattices (=integral quadratic forms) including the classification of the unimodular lattices in dimensions up to 25 and the construction of unimodular lattices with no roots in dimensions 26 and 27.114 pages, plain texNumber TheoryGroup Theorytext