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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">matatecs</journal-id><journal-title-group><journal-title xml:lang="ru">Математика и теоретические компьютерные науки</journal-title><trans-title-group xml:lang="en"><trans-title>Mathematics and Theoretical Computer Science</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2949-3919</issn><publisher><publisher-name>Казанский (Приволжский) федеральный университет</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">matatecs-14</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>НАУЧНЫЕ РАБОТЫ СТУДЕНТОВ</subject></subj-group></article-categories><title-group><article-title>О максимальной и минимальной площадях ожерелья</article-title><trans-title-group xml:lang="en"><trans-title>About the maximum and minimum areas of the necklace</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>Газизов</surname><given-names>Р. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Gazizov</surname><given-names>R. R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. Кремлевская, д. 18, г. Казань, 420008</p></bio><bio xml:lang="en"><p>18 Kremlyovskaya str., Kazan 420008</p></bio><email xlink:type="simple">rainurrrr2000@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Казанский (Приволжский) федеральный университет, Институт математики и механики им. Н.И. Лобачевского</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kazan Federal University, Lobachevskii Institute of Mathematics and Mechanics</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>31</day><month>10</month><year>2023</year></pub-date><volume>1</volume><issue>2</issue><fpage>50</fpage><lpage>61</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Газизов Р.Р., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Газизов Р.Р.</copyright-holder><copyright-holder xml:lang="en">Gazizov R.R.</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://matatecs.elpub.ru/jour/article/view/14">https://matatecs.elpub.ru/jour/article/view/14</self-uri><abstract><p>Исследуется экстремальная проблема, связанная с нахождением максимальной и минимальной площадей множества кругов, вписанных в область, ограниченную двумя касающимися окружностями</p></abstract><trans-abstract xml:lang="en"><p>An extreme problem related to finding the maximal and minimal areas of the set of circles inscribed into the bounded by two tangent circles</p></trans-abstract><kwd-group xml:lang="ru"><kwd>конформные отображения</kwd><kwd>дробно-линейные отображения</kwd><kwd>экстремальные задачи</kwd></kwd-group><kwd-group xml:lang="en"><kwd>conformal mappings</kwd><kwd>fractional-linear mappings</kwd><kwd>extremal problems</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">И. 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