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Density of Polynomial Maps

Published online by Cambridge University Press:  20 November 2018

Chen-Lian Chuang and
Tsiu-Kwen Lee
Chen-Lian Chuang
Affiliation:
Department of Mathematics, National Taiwan University, Taipei 106, Taiwan e-mail: chuang@math.ntu.edu.tw e-mail: tklee@math.ntu.edu.tw
Tsiu-Kwen Lee
Affiliation:
Department of Mathematics, National Taiwan University, Taipei 106, Taiwan e-mail: chuang@math.ntu.edu.tw e-mail: tklee@math.ntu.edu.tw
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Abstract

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Let $R$ be a dense subring of $\text{End}\left( _{D}V \right)$ , where $V$ is a left vector space over a division ring $D$ . If $\dim{{\,}_{D}}V\,=\,\infty $ , then the range of any nonzero polynomial $f\left( {{X}_{1}},\,\ldots \,,\,{{X}_{m}} \right)$ on $R$ is dense in $\text{End}\left( _{D}V \right)$ . As an application, let $R$ be a prime ring without nonzero nil one-sided ideals and $0\,\ne \,a\,\in \,R$ . If $af{{\left( {{x}_{1}},\ldots ,{{x}_{m}} \right)}^{n\left( {{x}_{i}} \right)}}\,=\,0$ for all ${{x}_{1}},\,\ldots \,,\,{{x}_{m}}\,\in \,R$ , where $n\left( {{x}_{i}} \right)$ is a positive integer depending on ${{x}_{1}},\,\ldots \,,\,{{x}_{m}}\,\in \,R$ , then $f\left( {{X}_{1}},\,\ldots \,,\,{{X}_{m}} \right)$ is a polynomial identity of $R$ unless $R$ is a finite matrix ring over a finite field.

Keywords

16D6016S50densitypolynomialendomorphism ringPI

Information

Type
Research Article
Information
Canadian Mathematical Bulletin , Volume 53 , Issue 2 , 01 June 2010, pp. 223 - 229
Copyright
Copyright © Canadian Mathematical Society 2010

References

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