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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">mathematics</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник российских университетов. Математика</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Universities Reports. Mathematics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2686-9667</issn><issn pub-type="epub">2782-3342</issn><publisher><publisher-name>Тамбовский государственный университет имени Г.Р. Державина</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.20310/1810-0198-2019-24-125-33-38</article-id><article-id custom-type="elpub" pub-id-type="custom">mathematics-287</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>СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ARTICLES</subject></subj-group></article-categories><title-group><article-title>О точных неравенствах треугольника в (q1; q2)-квазиметрических пространствах</article-title><trans-title-group xml:lang="en"><trans-title>On exact triangle inequalities in (q1; q2) -quasimetric spaces</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>Жуковская</surname><given-names>Зухра Тагировна</given-names></name><name name-style="western" xml:lang="en"><surname>Zhukovskaya</surname><given-names>Zukhra T.</given-names></name></name-alternatives><email xlink:type="simple">zyxra2@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Жуковский</surname><given-names>Сергей Евгеньевич</given-names></name><name name-style="western" xml:lang="en"><surname>Zhukovskiy</surname><given-names>Sergey E.</given-names></name></name-alternatives><email xlink:type="simple">s-ezhuk@yandex.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сенгупта</surname><given-names>Ричик</given-names></name><name name-style="western" xml:lang="en"><surname>Richik</surname><given-names>Sengupta</given-names></name></name-alternatives><email xlink:type="simple">veryricheek@hotmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГАОУ ВО «Российский университет дружбы народов»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>RUDN University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФГАОУ ВО «Российский университет дружбы народов»; ФГБУН «Институт проблем управления им. В. А. Трапезникова» Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>RUDN University; V. A. Trapeznikov Institute of Control Sciences of RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>22</day><month>04</month><year>2019</year></pub-date><volume>24</volume><issue>125</issue><fpage>33</fpage><lpage>38</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Жуковская З.Т., Жуковский С.Е., Сенгупта Р., 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Жуковская З.Т., Жуковский С.Е., Сенгупта Р.</copyright-holder><copyright-holder xml:lang="en">Zhukovskaya Z.T., Zhukovskiy S.E., Richik S.</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://mathematics.elpub.ru/jour/article/view/287">https://mathematics.elpub.ru/jour/article/view/287</self-uri><abstract><p>Для произвольного ( q 1 ; q 2) -квазиметрического пространства доказано существование функции f; для которой f -неравенство треугольника точнее, чем ( q 1 ; q 2) -неравенство треугольника. Показано, что найденная функция f является наименьшей функцией в классе вогнутых непрерывных функций g; для которых выполняется g -неравенство треугольника.</p></abstract><trans-abstract xml:lang="en"><p>For arbitrary ( q 1 ; q 2) -quasimetric space, it is proved that there exists a function f; such that f -triangle inequality is more exact than any ( q 1 ; q 2) -triangle inequality. It is shown that this function f is the least one in the set of all concave continuous functions g for which g -triangle inequality hold.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>(q</kwd><kwd>q) -квазиметрическое пространство</kwd></kwd-group><kwd-group xml:lang="en"><kwd>(q</kwd><kwd>q) -quasimetric space</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">А. В. Арутюнов, А. В. Грешнов, “Теория (q1; q2) -квазиметрических пространств и точки совпадения”, ДАН, 469:5 (2016), 527-531.</mixed-citation><mixed-citation xml:lang="en">А. В. Арутюнов, А. В. Грешнов, “Теория (q1; q2) -квазиметрических пространств и точки совпадения”, ДАН, 469:5 (2016), 527-531.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">А. В. Арутюнов, Лекции по выпуклому и многозначному анализу, Физматлит, М., 2014.</mixed-citation><mixed-citation xml:lang="en">А. В. Арутюнов, Лекции по выпуклому и многозначному анализу, Физматлит, М., 2014.</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>
