Results 71 to 80 of about 80,814 (154)

The hybrids of the ∆ − PJ theories

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы, 2020
When studying Jonsson theories, which are a wide subclass of inductive theories, it becomes necessary to study the so - called Jonsson sets. Similar problems are considered both in model theory and in universal algebra.
A.R. Yeshkeyev, N.M. Mussina
doaj  

Model-theoretical questions of the Jonsson spectrum

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы, 2020
In this paper, new concepts are defined in the framework of the study of Jonsson spectrum. We consider a spectrum with respect to the concept of cosemanticness, which is a generalization of elementary equivalence in the class of inductive, generally ...
A.R. Yeshkeyev
doaj  

Properties of lattices of the existential formulas of Jonsson fragments

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы, 2015
This article is devoted to studying of the properties of model - theoretic concepts of a fragment of the Jonsson sets and their application to the lattices of existential formulas.
A.R. Yeshkeyev, M.T. Kasymetova
doaj  

The cosemanticness of Kaiser hulls of fixed classes of models

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы
In this article, within the framework of the study of Jonsson theories, the model-theoretic properties of cosemanticness classes belonging to the factor set of the Jonsson spectrum of an existentially closed models’ subclass of some Jonsson theory in a ...
A.R. Yeshkeyev   +2 more
doaj   +1 more source

Educational Inequalities Among School Leavers in Ireland 1979-1994 [PDF]

open access: yes
The extent to which inequalities in educational outcomes persist in modern Ireland has been the subject of much debate. This paper investigates whether the rapid expansion in educational participation rates over the 1980s and early 1990s has led to a ...
Emer Smyth
core  

The Properties of Similarity for Jonsson’s Theories and Their Models

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы, 2015
Actually, we study the connections of the ∆-PJ-theories with their centers. The properties of various companions of some ∆-PJ-theories and their connection with this theory are considered. Also the similarity of the central types of ∆-PJ-theories in the enriched language is considered. In the class of perfect ∆-PJ-theories the conditions of coincidence
openaire   +1 more source

Strongly minimal Jonsson sets and their properties

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы, 2015
This article introduced and considered the Johnson sets and their fragments. And respectively was considered strongly minimal Jonsson sets. On this basis, introduced the concept of the independence of special subsets of existentially closed submodel of ...
A.R. Yeshkeyev
doaj  

Ossevazioni sulla dualità per operatori Booleani

open access: yesLe Matematiche, 1987
We extend the duality theory enstablished by Jònsson-Tarski-Halmos for Boolean hemimorphisms to a wider theory and we give some preliminary results.
Giulia Simi
doaj  

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