Buildings, group extensions and the cohomology of congruence subgroups
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🧮 math.GR
math.AT
keywords
buildingscohomologycongruenceextensionsgroupsubgroupsbettibounds
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We use buildings and group extensions to compute lower bounds on the top Betti numbers for the cohomology of the level p congruence subgroups of SL(3,Z) and Sp(4,Z).
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