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arxiv: 1001.0789 · v1 · submitted 2010-01-05 · 🧮 math.NT · math.KT

Perfect forms and the cohomology of modular groups

classification 🧮 math.NT math.KT
keywords groupscohomologyformsmodularperfectattachedcellclassification
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For N=5, 6 and 7, using the classification of perfect quadratic forms, we compute the homology of the Voronoi cell complexes attached to the modular groups SL_N(\Z) and GL_N(\Z). From this we deduce the rational cohomology of those groups.

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