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Trudy Matematicheskogo Instituta imeni V.A. Steklova, 2002, Volume 239, Pages 179–194
(Mi tm367)
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This article is cited in 1 scientific paper (total in 1 paper)
On Some Lattices Connected with a Finite Group
A. V. Zareluaab a M. V. Lomonosov Moscow State University, Faculty of Mechanics and Mathematics
b Moscow State Technological University "Stankin"
Abstract:
Let C[G] be the group ring of a finite group G, πr be a minimal central idempotent of this group ring, and Wr=C[G]πr be the corresponding minimal central two-sided ideal. The ring C[G] contains the group ring Z[G], whereby the ideal Wr contains a subring Ar=Z[G]πr. This article concerns the geometrical properties of location of the subring Ar in the ideal Wr. The following facts are proved: (1) generally, the subgroup Ar is not discrete in Wr; (2) if the associated irreducible character χr has integer values, then Ar is a lattice in Wr; (3) if the irreducible character χr is real, the converse is true as well; (4) for a symmetrization W∙r with respect to an action of a certain Galois group, the subgroup Z[G]π∙r is a lattice in W∙r.
Received in April 2002
Citation:
A. V. Zarelua, “On Some Lattices Connected with a Finite Group”, Discrete geometry and geometry of numbers, Collected papers. Dedicated to the 70th birthday of professor Sergei Sergeevich Ryshkov, Trudy Mat. Inst. Steklova, 239, Nauka, MAIK «Nauka/Inteperiodika», M., 2002, 179–194; Proc. Steklov Inst. Math., 239 (2002), 168–183
Linking options:
https://www.mathnet.ru/eng/tm367 https://www.mathnet.ru/eng/tm/v239/p179
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Abstract page: | 224 | Full-text PDF : | 88 | References: | 51 |
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