Davis, Michael W., Januszkiewicz, Tadeusz, Leary, Ian J. and Okun, Boris
Cohomology of hyperplane complements with group ring coefficients
International Mathematics Research Notices, 2011, (9), . (doi:10.1093/imrn/rnq151).
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We compute the cohomology with group ring coefficients of the complement of any finite collection of affine hyperplanes in complex n-space. It is non-zero in exactly one degree, namely the degree that is equal to the rank of the arrangement.
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