Properly discontinuous groups of affine
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Herbert Abels; Grigori A. Margulis; Grigori A. Soifer
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Article
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1997
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Elsevier Science
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English
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## RCsumk. Let lI' be a subgroup of the group of all affine transformations of a real aftine space A of finite dimension. Suppose that I' acts properly discontinuously on A. We determine which orthogonal groups can occur as Zariski closures of the linear part of l?. Our methods yield a proof of Au