|
This article is cited in 9 scientific papers (total in 9 papers)
Projections of Galois rings
S. S. Korobkov Ural State Pedagogical University, ul. K. Libknekhta 9, Yekaterinburg, 620065, Russia
Abstract:
Let $R$ and $R^\varphi$ be associative rings with isomorphic subring lattices and $\varphi$ be a lattice isomorphism (a projection) of the ring $R$ onto the ring $R^\varphi$. We call $R^\varphi$ the projective image of a ring $R$ and call the ring $R$ itself the projective preimage of a ring $R^\varphi$. We study lattice isomorphisms of Galois rings. By a Galois ring we mean a ring $GR(p^n,m)$ isomorphic to the factor
ring $K[x]/(f(x))$, where $K=Z/p^nZ$, $p$ is a prime, $f(x)$ is a polynomial of degree $m$ irreducible over $K$, and $(f(x))$ is a principal ideal generated by the polynomial $f(x)$ in the ring $K[x]$. Properties of the lattice of subrings of a Galois ring depend on values of numbers $n$ and $m$. A subring lattice $L$ of
$GR(p^n,m)$ has the simplest structure for $m=1$ ($L$ is a chain) and for $n=1$ ($L$ is distributive). It turned out that only in these cases there are examples of projections of Galois ring onto rings that are not Galois rings. We prove the following:
THEOREM. Let $R=GR(p^n,q^m)$, where $n>1$ and $m>1$. Then $R^\varphi\cong R$.
Keywords:
Galois rings, lattice isomorphisms of associative rings.
Received: 06.11.2013
Citation:
S. S. Korobkov, “Projections of Galois rings”, Algebra Logika, 54:1 (2015), 16–33; Algebra and Logic, 54:1 (2015), 10–22
Linking options:
https://www.mathnet.ru/eng/al672 https://www.mathnet.ru/eng/al/v54/i1/p16
|
Statistics & downloads: |
Abstract page: | 287 | Full-text PDF : | 75 | References: | 50 | First page: | 7 |
|