This article is cited in
5 papers
A sufficient condition for nonpresentability of structures in hereditarily finite superstructures
A. S. Morozovab a Sobolev Institute of Mathematics, pr. Akad. Koptyuga 4, Novosibirsk, 630090 Russia
b Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia
Abstract:
We introduce a class of existentially Steinitz structures containing, in particular, the fields of real and complex numbers. A general result is proved which implies that if
$\mathfrak M$ is an existentially Steinitz structure then the following structures cannot be embedded in any structure
$\Sigma$-presentable with trivial equivalence over
$\mathbb{HF}(\mathfrak M)$: the Boolean algebra of all subsets of
$\omega$, its factor modulo the ideal consisting of finite sets, the group of all permutations on
$\omega$, its factor modulo the subgroup of all finitary permutations, the semigroup of all mappings from
$\omega$ to
$\omega$, the lattice of all open sets of real numbers, the lattice of all closed sets of real numbers, the group of all permutations of
$\mathbb R$ $\Sigma$-definable with parameters over
$\mathbb{HF(R)}$, and the semigroup of such mappings from
$\mathbb R$ to
$\mathbb R$.
Keywords:
existentially Steinitz structure, hereditarily finite superstructure, $\Sigma$-presentability.
UDC:
510.65 Received: 09.10.2014
Revised: 09.10.2015
DOI:
10.17377/alglog.2016.55.305