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Математическая логика, алгебра и теория чисел
Constant expansion of theories and the number of countable models
B. S. Baizhanovab, O. A. Umbetbayevca a Institute of Mathematics and Mathematical Modeling, 28 Shevchenko Street, 050010, Almaty, Kazakhstan
b SDU University, 1/1 Abylai khan Street, 040900, Kaskelen, Kazakhstan
c Kazakh-British Technical University,
59 Tole bi Street,
050000, Almaty, Kazakhstan
Аннотация:
The present paper is dedicated to the method of constant expansion of a complete theory for studying its number of countable models. This paper aims to rehabilitate the method of constant expansion by demonstrating its continued relevance and its potential for use in counting the number of countable models. The main result reveals that the question of reducing the number of countable models from the continuum to a countable number by a constant expansion of a theory remains unanswered, contrary to previous beliefs.
Ключевые слова:
small theory, the number of countable models, expansion by constants, non-orthogonality of types, ordered structures.
Поступила 17 июля 2023 г., опубликована 12 ноября 2023 г.
Образец цитирования:
B. S. Baizhanov, O. A. Umbetbayev, “Constant expansion of theories and the number of countable models”, Сиб. электрон. матем. изв., 20:2 (2023), 1037–1051
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/semr1627 https://www.mathnet.ru/rus/semr/v20/i2/p1037
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