On discrete groups of the unit disk and their isomorphisms
نویسندگان
چکیده
منابع مشابه
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On the Discrete Unit Disk Cover Problem
Given a set P of n points and a set D of m unit disks on a 2-dimensional plane, the discrete unit disk cover (DUDC) problem is (i) to check whether each point in P is covered by at least one disk in D or not and (ii) if so, then find a minimum cardinality subset D∗ ⊆ D such that the unit disks in D∗ cover all the points in P. The discrete unit disk cover problem is a geometric version of the ge...
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Homology Isomorphisms between Algebraic Groups Made Discrete
THEOREM 1. Consider a split exact sequence of discrete groups Suppose there exists a normal series G = G 0 > G , o ... >(? " ^G n+1 = {1} (• •) such that: (1) GJG i+1 is a rational vector space for i = 0, ...,«; (2) GJG i+1 is contained in the centre ofG/G i+1 for i = 0,...,n; (3) there exists an element in the centre of T/G that induces a diagonalizable endomorphism of each GJG i+1 with all ei...
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ژورنال
عنوان ژورنال: Annales Academiae Scientiarum Fennicae Series A I Mathematica
سال: 1972
ISSN: 0066-1953
DOI: 10.5186/aasfm.1972.504