FUNDAMENTALNAYA I PRIKLADNAYA MATEMATIKA

(FUNDAMENTAL AND APPLIED MATHEMATICS)

2000, VOLUME 6, NUMBER 1, PAGES 275-280

On ranges of polynomials in the ring M2(Z/8Z)

V. V. Kuliamin

Abstract

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The main result of this article is the following: a subset $A$ of $2\times2$ matrices over the ring $\mathbb Z/8\mathbb Z$ is the range of a polynomial in noncommuting indeterminates with coefficients in $\mathbb Z/8\mathbb Z$ and without constant term if and only if $A$ contains $0$ and is selfsimilar, that is $\alpha A\alpha^{-1}\subseteq A$ for each invertible $2\times2$ matrix $\alpha$.

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Last modified: April 11, 2000