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CONNECTEDNESS IN STRUCTURES ON THE REAL NUMBERS: O-MINIMALITY AND UNDECIDABILITY

Part of: Model theory Fairly general properties Computability and recursion theory

Published online by Cambridge University Press:  18 February 2022

ALFRED DOLICH ,
CHRIS MILLER ,
ALEX SAVATOVSKY  and
ATHIPAT THAMRONGTHANYALAK
ALFRED DOLICH
Affiliation:
DEPARTMENT OF MATHEMATICS AND COMPUTER SCIENCE KINGSBOROUGH COMMUNITY COLLEGE 2001 ORIENTAL BOULEVARD BROOKLYN, NY11235, USA and DEPARTMENT OF MATHEMATICS THE GRADUATE CENTER 365 FIFTH AVENUE ROOM 4208 NEW YORK, NY10016, USAE-mail:[email protected]
CHRIS MILLER
Affiliation:
DEPARTMENT OF MATHEMATICS OHIO STATE UNIVERSITY 231 WEST 18TH AVENUE COLUMBUS, OH43210, USAE-mail:[email protected]
ALEX SAVATOVSKY
Affiliation:
DEPARTMENT OF MATHEMATICS AND STATISTICS UNIVERSITY OF KONSTANZ78457KONSTANZ, GERMANYCurrent address: DEPARTMENT OF MATHEMATICS, FACULTY OF NATURAL SCIENCES UNIVERSITY OF HAIFA 199 ABBA KHOUSHY AVENUE MOUNT CARMEL, HAIFA, 3498838, ISRAELE-mail:[email protected]
ATHIPAT THAMRONGTHANYALAK
Affiliation:
DEPARTMENT OF MATHEMATICS OHIO STATE UNIVERSITY 231 WEST 18TH AVENUE COLUMBUS, OH43210, USACurrent address: DEPARTMENT OF MATHEMATICS AND COMPUTER SCIENCE FACULTY OF SCIENCE CHULALONGKORN UNIVERSITYBANGKOK, 10330, THAILANDE-mail:[email protected]
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Abstract

We initiate an investigation of structures on the set of real numbers having the property that path components of definable sets are definable. All o-minimal structures on $(\mathbb {R},<)$ have the property, as do all expansions of $(\mathbb {R},+,\cdot ,\mathbb {N})$ . Our main analytic-geometric result is that any such expansion of $(\mathbb {R},<,+)$ by Boolean combinations of open sets (of any arities) either is o-minimal or defines an isomorph of $(\mathbb N,+,\cdot )$ . We also show that any given expansion of $(\mathbb {R}, <, +,\mathbb {N})$ by subsets of $\mathbb {N}^n$ (n allowed to vary) has the property if and only if it defines all arithmetic sets. Variations arise by considering connected components or quasicomponents instead of path components.

Keywords

o-minimallocally o-minimalpath componentquasicomponentundecidable

MSC classification

Primary: 03C64: Model theory of ordered structures; o-minimality
Secondary: 03D35: Undecidability and degrees of sets of sentences 54D99: None of the above, but in this section
Type
Article
Information
The Journal of Symbolic Logic , Volume 87 , Issue 3 , September 2022 , pp. 1243 - 1259
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of The Association for Symbolic Logic

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