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TRIPLET INVARIANCE AND PARALLEL SUMS

Part of: Homological methods Radicals and radical properties of rings

Published online by Cambridge University Press:  25 January 2021

TSIU-KWEN LEE Open the ORCID record for TSIU-KWEN LEE [Opens in a new window] ,
JHENG-HUEI LIN Open the ORCID record for JHENG-HUEI LIN [Opens in a new window]  and
TRUONG CONG QUYNH Open the ORCID record for TRUONG CONG QUYNH [Opens in a new window]
TSIU-KWEN LEE*
Affiliation:
Department of Mathematics, National Taiwan University, Taipei106, Taiwan
JHENG-HUEI LIN
Affiliation:
Department of Mathematics, National Taiwan University, Taipei106, Taiwan e-mail: r01221012@ntu.edu.tw
TRUONG CONG QUYNH
Affiliation:
Department of Mathematics, The University of Da Nang–University of Science and Education, Da Nang City, Vietnam e-mail: tcquynh@ued.udn.vn
*
e-mail: tklee@math.ntu.edu.tw
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Abstract

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Let R be a semiprime ring with extended centroid C and let $I(x)$ denote the set of all inner inverses of a regular element x in R. Given two regular elements $a, b$ in R, we characterise the existence of some $c\in R$ such that $I(a)+I(b)=I(c)$ . Precisely, if $a, b, a+b$ are regular elements of R and a and b are parallel summable with the parallel sum ${\cal P}(a, b)$ , then $I(a)+I(b)=I({\cal P}(a, b))$ . Conversely, if $I(a)+I(b)=I(c)$ for some $c\in R$ , then $\mathrm {E}[c]a(a+b)^{-}b$ is invariant for all $(a+b)^{-}\in I(a+b)$ , where $\mathrm {E}[c]$ is the smallest idempotent in C satisfying $c=\mathrm {E}[c]c$ . This extends earlier work of Mitra and Odell for matrix rings over a field and Hartwig for prime regular rings with unity and some recent results proved by Alahmadi et al. [‘Invariance and parallel sums’, Bull. Math. Sci.10(1) (2020), 2050001, 8 pages] concerning the parallel summability of unital prime rings and abelian regular rings.

Keywords

abelian ringextended centroidinner inverseparallel summableregular elementsemiprime (prime) ringtriplet invariance

MSC classification

Primary: 16N60: Prime and semiprime rings
Secondary: 16E50: von Neumann regular rings and generalizations
Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 104 , Issue 1 , August 2021 , pp. 118 - 126
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© Australian Mathematical Publishing Association Inc. 2021

Footnotes

The work of T.-K. Lee and J.-H. Lin was supported in part by the Ministry of Science and Technology of Taiwan (MOST 109-2115-M-002-014). The work of T. C. Quynh was supported in part by the Ministry of Education and Training of Vietnam (B2020-DNA-10).

References

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