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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">mais</journal-id><journal-title-group><journal-title xml:lang="ru">Моделирование и анализ информационных систем</journal-title><trans-title-group xml:lang="en"><trans-title>Modeling and Analysis of Information Systems</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1818-1015</issn><issn pub-type="epub">2313-5417</issn><publisher><publisher-name>Yaroslavl State University</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">mais-1022</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>Оригинальные 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 числе фасет 2-смежностного многогранника</article-title><trans-title-group xml:lang="en"><trans-title>On the number of facets of a 2-neighborly polytope</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>Максименко</surname><given-names>А. Н.</given-names></name></name-alternatives><email xlink:type="simple">maksimenko_a_n@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="ru" id="aff-1"><institution>Ярославский государственный университет им. П.Г. Демидова</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2010</year></pub-date><pub-date pub-type="epub"><day>20</day><month>03</month><year>2010</year></pub-date><volume>17</volume><issue>1</issue><fpage>76</fpage><lpage>82</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Максименко А.Н., 2010</copyright-statement><copyright-year>2010</copyright-year><copyright-holder xml:lang="ru">Максименко А.Н.</copyright-holder><copyright-holder xml:lang="en">Максименко А.Н.</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.mais-journal.ru/jour/article/view/1022">https://www.mais-journal.ru/jour/article/view/1022</self-uri><abstract><p>Многогранник Р называется 2-смежностным, если любые две его вершины образуют ребро (1-грань) многогранника P. Высказывается предположение, что число fо(Р) вершин такого многогранника не превосходит числа его фасет (граней наибольшей размерности). Доказывается справедливость утверждения для случаев d &lt; 7 и fо(Р) &lt; d + 6, где d - размерность многогранника.</p></abstract><trans-abstract xml:lang="en"><p>A d-polytope P is 2-neighborly if each 2 vertices of P determine an edge. It is conjectured that the number f0(P) of vertices for such polytope does not exceed the number fd-1(P) of facets. The conjecture is separately proved for d &lt; 7 and for f0(P) &lt; 
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