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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">cheb</journal-id><journal-title-group><journal-title xml:lang="ru">Чебышевский сборник</journal-title><trans-title-group xml:lang="en"><trans-title>Chebyshevskii Sbornik</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-8383</issn><publisher><publisher-name>Tula State Lev Tolstoy  Pedagogical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22405/2226-8383-2023-24-4-354-360</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-1612</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Краткие сообщения</subject></subj-group></article-categories><title-group><article-title>Об экстремальном множестве частных целых чисел</article-title><trans-title-group xml:lang="en"><trans-title>On the extremal set of quotient of natural numbers</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Штейников</surname><given-names>Юрий Николаевич</given-names></name><name name-style="western" xml:lang="en"><surname>Shteinikov</surname><given-names>Yuri Nikolaevich</given-names></name></name-alternatives><email xlink:type="simple">yuriisht@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Федеральный научный центр «Научно-исследовательский институт системных исследований Российской академии наук»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Federal Research Center “Research Institute of System Research&#13;
of the Russian Academy of Sciences”</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>28</day><month>01</month><year>2024</year></pub-date><volume>24</volume><issue>4</issue><fpage>354</fpage><lpage>360</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Штейников Ю.Н., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Штейников Ю.Н.</copyright-holder><copyright-holder xml:lang="en">Shteinikov Y.N.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.chebsbornik.ru/jour/article/view/1612">https://www.chebsbornik.ru/jour/article/view/1612</self-uri><abstract><p>В статье изучается следующая задача. Пусть заданы два конечных подмножества из множества натуральных чисел, которые всюду в тексте будут обозначаться как 𝐴 и 𝐵. Будем считать, что они принадлежат конечному отрезку чисел [1,𝑄]. По определению задаем множество дробей 𝐴/𝐵, элементы которого являются представимыми в виде частного этих множеств 𝐴,𝐵, то есть такие элементы 𝑎/𝑏, где 𝑎 ∈ 𝐴, 𝑏 ∈ 𝐵. В статье исследуются свойстваэтого подмножества частных. В статье [<xref ref-type="bibr" rid="cit13">13</xref>], была получена нетривиальная нижняя оценка на размер множества 𝐴/𝐵 для таких множеств 𝐴,𝐵 без всяких дополнительных условий на эти множества. В данной статье мы рассматриваем экстремальный случай , который состоит в следующем. Пусть известно, что размер множества произведений 𝐴𝐵 является асимптотически наименьшим возможным. Мы выводим отсюда, что размер множества частных 𝐴/𝐵 является асимптотически наибольшей возможной величиной.</p></abstract><trans-abstract xml:lang="en"><p>The article studies the following problem. Let two finite subsets from the set of natural numbers be given, which will be denoted throughout the text as 𝐴 and 𝐵. We will assume that they belong to a finite interval of numbers [1,𝑄]. By definition, we define a set of fractions 𝐴/𝐵 whose elements are representable as a quotient of these sets 𝐴,𝐵, in other words such elements 𝑎/𝑏, where 𝑎 ∈ 𝐴, 𝑏 ∈ 𝐵. The article investigates the properties of this subset of quotients. Inthe article [<xref ref-type="bibr" rid="cit13">13</xref>], a non-trivial lower bound on the size of the set 𝐴/𝐵 for such sets 𝐴,𝐵 was obtained without any additional conditions on these sets. In this article, we in details consider an extreme case, which is as follows. Let it be known that the size of the set of products 𝐴𝐵 isasymptotically the smallest possible. We deduce from this that the size of the set of quotients 𝐴/𝐵 is the asymptotically largest possible value.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>натуральные числа</kwd><kwd>плотность</kwd><kwd>гладкие числа</kwd><kwd>произведение.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>integer numbers</kwd><kwd>density</kwd><kwd>smooth numbers</kwd><kwd>product.</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Shteinikov Yu., On the product sets of rational numbers // Proceedings of the Steklov Institute of Mathematics, 2017, Vol. 296, Issue 1, P 243-250.</mixed-citation><mixed-citation xml:lang="en">Shteinikov Yu., “On the product sets of rational numbers”, Proceedings of the Steklov Institute of Mathematics vol. 296, Issue 1, pp. 243-250.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Cilleruelo J., Ramana D.S., Ramare O. Quotients and product sets of thin subsets of the positive integers // Proceedings of the Steklov Institute of Mathematics, 2017, Vol. 296, Issue 1, P. 52-64.</mixed-citation><mixed-citation xml:lang="en">Cilleruelo J., Ramana D.S., Ramare O. “Quotients and product sets of thin subsets of the positive integers”, Proceedings of the Steklov Institute of Mathematics, vol. 296, Iss. 1, pp. 52-64.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Prachar K. Primzahlverteilung // Springer–Verlag Berlin–G˝ottingen–Heidelberg, 1957.</mixed-citation><mixed-citation xml:lang="en">Prachar K. 1957, “Primzahlverteilung”, Springer–Verlag Berlin–G˝ottingen–Heidelberg.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Shteinikov Yu. N. Addendum to the paper "Quotients and product sets of thin subsets of the positive integers"by J. Cilleruelo, D.S. Ramana and O. Ramare. // Proceedings of the Steklov Institute of Mathematics, 2017, Vol. 296, Issue 1, P. 251-255.</mixed-citation><mixed-citation xml:lang="en">Shteinikov Yu. N. “Addendum to the paper “Quotients and product sets of thin subsets of the positive integers” by J. Cilleruelo, D.S. Ramana and O. Ramare”, Proceedings of the Steklov Institute of Mathematics vol. 296, Iss. 1, pp. 251-255.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Hildebrand A., Tenenbaum G. Integers without large prime factors // Journal de Theorie des Nombres de Bordeaux 5, 1993, P. 411-484.</mixed-citation><mixed-citation xml:lang="en">Hildebrand A., Tenenbaum G. 1993, “Integers without large prime factors”, Journal de Theorie des Nombres de Bordeaux vol. 5, pp. 411–484.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Bourgain J., Konyagin S.V., Shparlinski I.E. Product sets of rationals, multiplicative translates of subgroups in residue rings and fixed points of the discrete logarithm // Int. Math Research Notices. 2008. rnn 090, P. 1-29.</mixed-citation><mixed-citation xml:lang="en">Bourgain J., Konyagin S.V., Shparlinski I.E. 2008, “Product sets of rationals, multiplicative translates of subgroups in residue rings and fixed points of the discrete logarithm”, Int. Math Research Notices.. rnn 090, pp. 1–29.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Cilleruelo J. A note on product sets of rationals // International Journal of Number Theory 2016, Vol. 12, No. 05, P. 1415-1420.</mixed-citation><mixed-citation xml:lang="en">Cilleruelo J. 2016, “A note on product sets of rationals”, International Journal of Number Theory, vol. 12, no. 05, pp. 1415–1420.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Cilleruelo J., Garaev M. Congruences involving product of intervals and sets with small multiplicative doubling modulo a prime and applications // Math. Proc. Cambridge Phil. Soc., 2016. Vol. 160, Issue 03, P. 477-494,</mixed-citation><mixed-citation xml:lang="en">Cilleruelo J., Garaev M. 2016, “Congruences involving product of intervals and sets with small multiplicative doubling modulo a prime and applications”, Math. Proc. Cambridge Phil. Soc., vol. 160, Iss. 03, pp. 477–494.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Konyagin S., Shkredov I. New results on sums and products in R, Proc. // Steklov Inst. Math., 2016. № 294 , P. 78-88.</mixed-citation><mixed-citation xml:lang="en">Konyagin S., Shkredov I. 2016, “New results on sums and products in R”„ Proc. Steklov Inst. Math., vol. 294 , pp. 78–88.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Konyagin S., Shkredov I. On Sum Sets of Sets Having Small Product Set // Proc. Steklov Inst. Math. 2015, Vol. 290, P. 288–299.</mixed-citation><mixed-citation xml:lang="en">Konyagin S., Shkredov I. “On Sum Sets of Sets Having Small Product Set”, Proc. Steklov Inst. Math. vol. 290, pp. 288–299.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Tao T., Vu V. Additive combinatorics // Cambridge University Press 2006, P. 1-530.</mixed-citation><mixed-citation xml:lang="en">Tao T., Vu V. 2006, “Additive combinatorics”, Cambridge University Press, pp. 1-530.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Shnirel’man L.G. Uber additive Eigenschaften von Zahlen // Mathematische Annalen, V. 107 1933, P. 649-690.</mixed-citation><mixed-citation xml:lang="en">Shnirel’man L.G. 1933, “Uber additive Eigenschaften von Zahlen”, Mathematische Annalen, vol. 107, , pp. 649-690.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Ю. Н. Штейников, О размере частного двух подмножеств натуральных чисел // Гармонический анализ, теория приближений и теория чисел, Сборник статей. К 60-летию со дня рождения академика Сергея Владимировича Конягина, Тр. МИАН, 2018. Т. 303, МАИК «Наука/Интерпериодика», М., С. 279–287.</mixed-citation><mixed-citation xml:lang="en">Shteinikov Yu.N. “On the Size of the Quotient of Two Subsets of Positive Integers”, Proceedings of the Steklov Institute of Mathematics volume vol. 303, pp. 259–267.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
