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THE REGULAR PART OF A SEMIGROUP OF LINEAR TRANSFORMATIONS WITH RESTRICTED RANGE

Part of: Semigroups

Published online by Cambridge University Press:  20 February 2017

WORACHEAD SOMMANEE  and
KRITSADA SANGKHANAN
WORACHEAD SOMMANEE
Affiliation:
Department of Mathematics and Statistics, Faculty of Science and Technology, Chiang Mai Rajabhat University, Chiang Mai 50300, Thailand email worachead_som@cmru.ac.th
KRITSADA SANGKHANAN*
Affiliation:
Department of Mathematics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand email kritsada.s@cmu.ac.th
*
✉kritsada.s@cmu.ac.th
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Abstract

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Let $V$ be a vector space and let $T(V)$ denote the semigroup (under composition) of all linear transformations from $V$ into $V$. For a fixed subspace $W$ of $V$, let $T(V,W)$ be the semigroup consisting of all linear transformations from $V$ into $W$. In 2008, Sullivan [‘Semigroups of linear transformations with restricted range’, Bull. Aust. Math. Soc.77(3) (2008), 441–453] proved that

$$\begin{eqnarray}\displaystyle Q=\{\unicode[STIX]{x1D6FC}\in T(V,W):V\unicode[STIX]{x1D6FC}\subseteq W\unicode[STIX]{x1D6FC}\} & & \displaystyle \nonumber\end{eqnarray}$$
is the largest regular subsemigroup of $T(V,W)$ and characterized Green’s relations on $T(V,W)$. In this paper, we determine all the maximal regular subsemigroups of $Q$ when $W$ is a finite-dimensional subspace of $V$ over a finite field. Moreover, we compute the rank and idempotent rank of $Q$ when $W$ is an $n$-dimensional subspace of an $m$-dimensional vector space $V$ over a finite field $F$.

Keywords

linear transformationsregular subsemigroupsrankidempotent rank

MSC classification

Primary: 20M20: Semigroups of transformations, etc.
Type
Research Article
Information
Journal of the Australian Mathematical Society , Volume 103 , Issue 3 , December 2017 , pp. 402 - 419
Copyright
© 2017 Australian Mathematical Publishing Association Inc. 

Footnotes

This research was supported by Chiang Mai University.

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