Results 11 to 20 of about 4,282 (201)

On categoricity questions for universal unars and undirected graphs under semantic Jonsson quasivariety [PDF]

Қарағанды университетінің хабаршысы. Математика сериясы, 2023
The article is devoted to the study of semantic Jonsson quasivarieties of universal unars and undirected graphs. The first section of the article consists of basic necessary concepts from Jonsson model theory.
A.R. Yeshkeyev, A.R. Yarullina, S.M. Amanbekov   +2 more
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Normal Jonsson theories and their Kaiser classes

Қарағанды университетінің хабаршысы. Математика сериясы
We present results concerning new notion connected with the study of Jonsson theories. The new notion is a Kaiser class of models for arbitrary Jonsson theories.
A.R. Yeshkeyev, M.T. Kassymetova, N.M. Mussina   +2 more
doaj   +3 more sources

Double factorization of the Jonsson spectrum

Қарағанды университетінің хабаршысы. Математика сериясы
First of all, we have to note that in this article, we introduced the new concepts of relations between Jonsson theories in the class of cosemanticness for some considered Jonsson spectrum.
A.R. Yeshkeyev, O.I. Ulbrikht, M.T. Omarova   +2 more
doaj   +3 more sources

Similarities of Jonsson spectra’s classes

Қарағанды университетінің хабаршысы. Математика сериясы, 2023
The study of syntactic and semantic properties of a first-order language, generally speaking, for incomplete theories, is one of the urgent problems of mathematical logic.
A.R. Yeshkeyev, O.I. Ulbrikht, G.A. Urken   +2 more
doaj   +3 more sources

Model-theoretic properties of J-superstable Jonsson theories in classes defined by cosemanticness

Қарағанды университетінің хабаршысы. Математика сериясы
This article deals with the problems of model-theoretic characterization of J-superstable Jonsson theories. The characteristic features of such theories are analyzed in terms of J-stability, J-P-superstability, and J-nonmultidimensionality.
A.R. Yeshkeyev, G.E. Zhumabekova, A.K. Issayeva   +2 more
doaj   +3 more sources

On closure operators of Jonsson sets

Қарағанды университетінің хабаршысы. Математика сериясы
The work is related to the study of the model-theoretic properties of Jonsson theories, which, generally speaking, are not complete. In the article, on the Boolean of Jonsson subsets of the semantic model of some fixed Jonsson theory, the concept of the
Olga Ulbrikht
doaj   +3 more sources

Connection of Jonsson theory with some Jonsson polygons theories

Қарағанды университетінің хабаршысы. Математика сериясы, 2019
This article presents the result related to the model - theoretic properties of special subsets of the semantic model of some fixed Jonsson theory. The specialty of these sets is due to their definability and closure.
A.R. Yeshkeyev, G.A. Urken
doaj   +3 more sources

Connection between the amalgam and joint embedding properties [PDF]

Қарағанды университетінің хабаршысы. Математика сериясы, 2022
The paper aims to study the model-theoretic properties of differentially closed fields of zero and positive characteristics in framework of study of Jonsson theories.
A.R. Yeshkeyev, I.O. Tungushbayeva, M.T. Kassymetova   +2 more
doaj   +3 more sources

Existentially prime Jonsson quasivarieties and their Jonsson spectra [PDF]

Қарағанды университетінің хабаршысы. Математика сериясы, 2022
This article is devoted to the study of Jonsson quasivarieties in a signature enriched with new predicate and constant symbols. New concepts of semantic Jonsson quasivariety and fragment-conservativeness of the center of the Jonsson theory are ...
A. R. Yeshkeyev, I. O. Tungushbayeva, S. M. Amanbekov   +2 more
doaj   +2 more sources

Existentially positive Mustafin theories of S-acts over a group [PDF]

Қарағанды университетінің хабаршысы. Математика сериясы, 2022
The paper is connected with the study of Jonsson spectrum notion of the fixed class of models of Sacts signature, assuming a group as a monoid of S-acts.
A.R. Yeshkeyev, O.I. Ulbrikht, A.R. Yarullina   +2 more
doaj   +3 more sources