Discrete Cocompact Subgroups of the Four
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Paul Milnes; Samuel Walters
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Article
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2001
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Elsevier Science
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English
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Let G 4 be the unique, connected, simply connected, four-dimensional, nilpotent Lie group. In this paper, the discrete cocompact subgroups H of G 4 are classified and shown to be in 1-1 correspondence with triples p 1 p 2 p 3 โ 3 that satisfy p 2 p 3 > 0 and a certain restriction on p 1 . The K-grou