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The multiplicative subgroups of division rings

Research Project

Project/Area Number 09640080
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Algebra
Research InstitutionNiihama National College of Technology

Principal Investigator

CHIBA Katsuo  Nlihama National College of Technolgy, Emgineering Science, Associate professor, 数理科, 助教授 (60141933)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
Keywordsdivision ring / free group ring / skew polynomial ring / valuation / free field / free group / free algebra / free group algebra / free field
Research Abstract

In [J.Algebra 185 (1996), 298-313], Figueiredo, Goncalves and Shirvani stated the following : The division ring of fractions of a skew polynomial ring over a rational function field of a single variable contains a non-commutative free gruop algebra, if it is not a P1-ring, It is difficalt to understand the proof of their results completely. They used the valuation of the division rings In this research we study free fields in division rings with complete discrete valuation. The main results are the followings.
1. Let D be a division ring with a complete discrete valuation and the center of D is infinite, if the dimention of D is infinite, then D contains the free field K <z (x, y)> on a set {x, y}. In particular, the multiplicative group of D contains a noncommutative free group.
2. For any commutative field k, the free field k <(x, y)> on a set {x, y} has discrete valuation v such that v(x)=m, v(x) n for any integers m, n.
It is interesting to cassify the discrete valations of the free field k <(x, y)> on k.
The following cojecture is more plausible. The division ring of fractions of the Weylalgebra over a field k of characteristic zero does not contain the free field k <(x, y)> on a set {x, y}

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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