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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/2220-8054-2016-7-5-888-892</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-1002</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></article-categories><title-group><article-title>Characterization of the normal subgroups of finite index  for the group representation of a Cayley tree</article-title><trans-title-group xml:lang="ru"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Haydarov</surname><given-names>F. H.</given-names></name></name-alternatives><bio xml:lang="en"><p>Tashkent</p></bio><email xlink:type="simple">haydarov_imc@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>National University of Uzbekistan</institution><country>Uzbekistan</country></aff><pub-date pub-type="collection"><year>2016</year></pub-date><pub-date pub-type="epub"><day>15</day><month>08</month><year>2025</year></pub-date><volume>7</volume><issue>5</issue><fpage>888</fpage><lpage>892</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Haydarov F.H., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Haydarov F.H.</copyright-holder><copyright-holder xml:lang="en">Haydarov F.H.</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://nanojournal.ifmo.ru/jour/article/view/1002">https://nanojournal.ifmo.ru/jour/article/view/1002</self-uri><abstract><p> In this paper we give a characterization of normal subgroups for the group representation of the Cayley tree.</p></abstract><kwd-group xml:lang="en"><kwd>Cayley tree</kwd><kwd>Gk-group</kwd><kwd>normal subgroup</kwd><kwd>homomorphism</kwd><kwd>epimorphism</kwd></kwd-group><funding-group><funding-statement xml:lang="en">I am deeply grateful to Professor U.A. Rozikov for the attention to my work.I am deeply grateful to Professor U.A. Rozikov for the attention to my work.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">U.A. Rozikov. Gibbs measures on a Cayley trees, World Sci. Pub, Singapore, 2013.</mixed-citation><mixed-citation xml:lang="en">U.A. Rozikov. Gibbs measures on a Cayley trees, World Sci. Pub, Singapore, 2013.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Cohen D.E., Lyndon R.C. Free bases for normal subgroups of free groups, Trans. Amer. Math. Soc., 1963, 108, P. 526–537.</mixed-citation><mixed-citation xml:lang="en">Cohen D.E., Lyndon R.C. Free bases for normal subgroups of free groups, Trans. Amer. Math. 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