Abstract
We show that for many natural computable metric spaces and computable domains the first order theory of the lattice of effectively open sets is hereditarily undecidable. Moreover, for several important spaces (e.g., finite-dimensional Euclidean spaces and the domain \(P\omega \)) this theory is m-equivalent to the first-order arithmetic.
O.V. Kudinov—Supported by RFBR projects 13-01-00015a and 14-01-00376.
V.L. Selivanov—Supported by RFBR project 13-01-00015a.
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Acknowledgement
We thank André Nies for a discussion of the lower bound problem for \(Th(\varSigma ^0_1(\mathcal {N}))\), and the referees for valuable comments.
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Kudinov, O.V., Selivanov, V.L. (2016). On the Lattices of Effectively Open Sets. In: Beckmann, A., Bienvenu, L., Jonoska, N. (eds) Pursuit of the Universal. CiE 2016. Lecture Notes in Computer Science(), vol 9709. Springer, Cham. https://doi.org/10.1007/978-3-319-40189-8_31
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DOI: https://doi.org/10.1007/978-3-319-40189-8_31
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