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More undecidable lattices of Steinitz exchange systems

Published online by Cambridge University Press:  12 March 2014

L. R. Galminas
Affiliation:
Department of Mathematics, Northwestern State University of Louisiana, Natchitoches, LA 71457., USA, E-mail: [email protected]
John W. Rosenthal
Affiliation:
Department of Mathematics, Ithaca College, Ithaca. NY 14850, USA, E-mail: [email protected]

Abstract

We show that the first order theory of the lattice <ω(S) of finite dimensional closed subsets of any nontrivial infinite dimensional Steinitz Exhange System S has logical complexity at least that of first order number theory and that the first order theory of the lattice (S) of computably enumerable closed subsets of any nontrivial infinite dimensional computable Steinitz Exchange System S has logical complexity exactly that of first order number theory. Thus, for example, the lattice of finite dimensional subspaces of a standard copy of ⊕ωQ interprets first order arithmetic and is therefore as complicated as possible. In particular, our results show that the first order theories of the lattice (V) of c.e. subspaces of a fully effective ℵ0-dimensional vector space V and the lattice of c.e. algebraically closed subfields of a fully effective algebraically closed field F of countably infinite transcendence degree each have logical complexity that of first order number theory.

Type
Research Article
Copyright
Copyright © Association for Symbolic Logic 2002

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