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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">10.22405/2226-8383-2022-23-4-394-404</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-1401</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>Памятные даты</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Memorable dates</subject></subj-group></article-categories><title-group><article-title>К 85-летию Ашота Енофовича Устяна</article-title><trans-title-group xml:lang="en"><trans-title>On the 85th anniversary of Ashot Enofovich Ustyan</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>Добровольский</surname><given-names>Николай Михайлович</given-names></name><name name-style="western" xml:lang="en"><surname>Dobrovol’skii</surname><given-names>Nikolai Mihailovich</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук, профессор</p></bio><bio xml:lang="en"><p>doctor of physical and mathematical sciences, professor</p></bio><email xlink:type="simple">dobrovol@tsput.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>Манохин</surname><given-names>Евгений Викторович</given-names></name><name name-style="western" xml:lang="en"><surname>Manokhin</surname><given-names>Evgeny Viktorovich</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук</p></bio><bio xml:lang="en"><p>candidate of physical and mathematical sciences</p></bio><email xlink:type="simple">emanfinun@mail.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>Добрынина</surname><given-names>Ирина Васильевна</given-names></name><name name-style="western" xml:lang="en"><surname>Dobrynina</surname><given-names>Irina Vasil’evna</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук</p></bio><email xlink:type="simple">dobrynirina@yandex.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чубариков</surname><given-names>Владимир Николаевич</given-names></name><name name-style="western" xml:lang="en"><surname>Chubarikov</surname><given-names>Vladimir Nikolaevich</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук, профессор</p></bio><bio xml:lang="en"><p>doctor of physical and mathematical sciences, professor</p></bio><email xlink:type="simple">chubarik2020@mail.ru</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Добровольский</surname><given-names>Николай Николаевич</given-names></name><name name-style="western" xml:lang="en"><surname>Dobrovol’skii</surname><given-names>Nikolai Nikolaevich</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук</p></bio><bio xml:lang="en"><p>candidate of physical and mathematical sciences</p></bio><email xlink:type="simple">nikolai.dobrovolsky@gmail.com</email><xref ref-type="aff" rid="aff-5"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Реброва</surname><given-names>Ирина Юрьевна</given-names></name><name name-style="western" xml:lang="en"><surname>Rebrova</surname><given-names>Irina Yuryevna</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук</p></bio><bio xml:lang="en"><p>candidate of physical and mathematical sciences</p></bio><email xlink:type="simple">i_rebrova@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Тульский государственный педагогический университет им. Л. Н. Толстого</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Tula State Lev Tolstoy Pedagogical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Финансовый университет при Правительстве Российской Федерации (Тульский филиал)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Financial University under the Government of the Russian Federation (Tula Branch)</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Академия гражданской защиты МЧС России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>doctor of physical and mathematical sciences, Academy of Civil Protection EMERCOM of Russia</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>Московский государственный университет им. М. В. Ломоносова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Lomonosov Moscow State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-5"><aff xml:lang="ru"><institution>Тульский государственный педагогический университет им. Л. Н. Толстого; Тульский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Tula State Lev Tolstoy Pedagogical University; Tula State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>16</day><month>01</month><year>2023</year></pub-date><volume>23</volume><issue>4</issue><fpage>394</fpage><lpage>404</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Добровольский Н.М., Манохин Е.В., Добрынина И.В., Чубариков В.Н., Добровольский Н.Н., Реброва И.Ю., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Добровольский Н.М., Манохин Е.В., Добрынина И.В., Чубариков В.Н., Добровольский Н.Н., Реброва И.Ю.</copyright-holder><copyright-holder xml:lang="en">Dobrovol’skii N.M., Manokhin E.V., Dobrynina I.V., Chubarikov V.N., Dobrovol’skii N.N., Rebrova I.Y.</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/1401">https://www.chebsbornik.ru/jour/article/view/1401</self-uri><abstract><p>Данная работа посвящена 85-летию профессора Ашота Енофовича Устяна.В работе приводятся факты из биографии юбиляра. Даются сведения о научной работе А. Е. Устяна. Уделяется достаточное место организационно-педагогической деятельности профессора А. Е. Устяна. Приводятся сведения о наградах и поощрениях А. Е. Устяна за его плодотворную научную и педагогическую деятельность.</p></abstract><trans-abstract xml:lang="en"><p>This work is dedicated to the 85th anniversary of Professor Ashot Enofovich Ustyan.The paper presents facts from the biography of the hero of the day.Information about the scientific work of A. E. Ustyan is given.Sufficient space is given to the organizational and pedagogical activities of Professor A. E. Ustyan.The information about awards and incentives of A. E. Ustyan for his fruitful scientific and pedagogical activity is given.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>М. Д. Гриндлингер</kwd><kwd>А. Е. Устян</kwd><kwd>алгоритмические проблемы теории полугрупп</kwd><kwd>проблема равенства слов</kwd><kwd>проблема вложимости полугрупп в группы.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>M. D. Grindlinger</kwd><kwd>A. E. Ustyan</kwd><kwd>algorithmic problems of semigroup theory</kwd><kwd>the problem of word equality</kwd><kwd>the problem of embeddability of semigroups into groups.</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">Устян А. Е. Примеры полугрупп с неразрешенной проблемой тождества слов // Ученые</mixed-citation><mixed-citation xml:lang="en">Ustyan A. E., 1970, “Examples of semigroups with an unresolved word identity problem” //</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">записки математических кафедр. 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E., 1990, “The problem of word identity for quotient semigroups of free products” //</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Межвузовский сборник «Алгоритмические проблемы теории групп и полугрупп». Тула,</mixed-citation><mixed-citation xml:lang="en">Interuniversity collection “Algorithmic problems of the theory of groups and semigroups”, Tula.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Ustyan A. E., 1986, “On the problem of left divisibility for finitely defined semigroups of 𝐾</mixed-citation><mixed-citation xml:lang="en">Ustyan A. E., 1986, “On the problem of left divisibility for finitely defined semigroups of 𝐾</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Устян А. Е. 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