Algebras of distributions of binary isolating formulas over a type for quite o-minimal theories with nonmaximal number of countable models are described. It is proved that an isomorphism of these algebras for two 1-types is characterized by the coincidence of convexity ranks and also by simultaneous satisfaction of isolation, quasirationality, or irrationality of those types. It is shown that for quite o-minimal theories with nonmaximum many countable models, every algebra of distributions of binary isolating formulas over a pair of nonweakly orthogonal types is a generalized commutative monoid.
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Supported by RFBR (project No. 17-01-00531-a), by KN MON RK (project No. AP05132546), and by SB RAS Fundamental Research Program I.1.1 (project No. 0314-2019-0002).
Translated from Algebra i Logika, Vol. 57, No. 6, pp. 662-683, November-December, 2018.
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Emel’yanov, D.Y., Kulpeshov, B.S. & Sudoplatov, S.V. Algebras of Distributions of Binary Isolating Formulas for Quite o-Minimal Theories. Algebra Logic 57, 429–444 (2019). https://doi.org/10.1007/s10469-019-09515-5
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DOI: https://doi.org/10.1007/s10469-019-09515-5