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  <front>
    <journal-meta>
      <journal-id journal-id-type="issn">2411-3336</journal-id>
      <journal-id journal-id-type="eissn">2541-9404</journal-id>
      <journal-title-group>
        <journal-title xml:lang="ru">Записки Горного института</journal-title>
        <journal-title xml:lang="en">Journal of Mining Institute</journal-title>
      </journal-title-group>
      <publisher>
        <publisher-name xml:lang="ru">Санкт-Петербургский горный университет императрицы Екатерины ΙΙ</publisher-name>
        <publisher-name xml:lang="en">Empress Catherine II Saint Petersburg Mining University</publisher-name>
      </publisher>
    </journal-meta>
    <article-meta>
      <article-id custom-type="pmi" pub-id-type="custom">pmi-15122</article-id>
      <article-id pub-id-type="uri">https://pmi.spmi.ru/pmi/article/view/15122</article-id>
      <article-categories>
        <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 xml:lang="en">Theorem relating to a system of circles</article-title>
        <trans-title-group xml:lang="ru">
          <trans-title>Теорема, относящаяся к системе кругов</trans-title>
        </trans-title-group>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Fedorov</surname>
            <given-names>E. S.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Федоров</surname>
              <given-names>Е. С.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Fedorov</surname>
              <given-names>E. S.</given-names>
            </name>
          </name-alternatives>
          <email>pmi@spmi.ru</email>
          <xref ref-type="aff" rid="aff1"/>
        </contrib>
        <aff-alternatives id="aff1">
          <aff>
            <institution xml:lang="ru"> (Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en"> (Russia)</institution>
          </aff>
        </aff-alternatives>
      </contrib-group>
      <pub-date pub-type="epub" iso-8601-date="1914-01-01">
        <day>01</day>
        <month>01</month>
        <year>1914</year>
      </pub-date>
      <pub-date date-type="collection">
        <year>1914</year>
      </pub-date>
      <volume>5</volume>
      <issue>1</issue>
      <fpage>17</fpage>
      <lpage>18</lpage>
      <history>
        <date date-type="received" iso-8601-date="1913-07-16">
          <day>16</day>
          <month>07</month>
          <year>1913</year>
        </date>
        <date date-type="accepted" iso-8601-date="1913-09-19">
          <day>19</day>
          <month>09</month>
          <year>1913</year>
        </date>
        <date date-type="rev-recd" iso-8601-date="1914-01-01">
          <day>01</day>
          <month>01</month>
          <year>1914</year>
        </date>
      </history>
      <permissions>
        <copyright-statement xml:lang="ru">© 1914 Е. С. Федоров</copyright-statement>
        <copyright-statement xml:lang="en">© 1914 E. S. Fedorov</copyright-statement>
        <copyright-year>1914</copyright-year>
        <copyright-holder xml:lang="ru">Е. С. Федоров</copyright-holder>
        <copyright-holder xml:lang="en">E. S. Fedorov</copyright-holder>
        <license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0" xml:lang="ru">
          <license-p>Эта статья доступна по лицензии Creative Commons Attribution 4.0 International (CC BY 4.0)</license-p>
        </license>
        <license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0" xml:lang="en">
          <license-p>This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0)</license-p>
        </license>
      </permissions>
      <self-uri xlink:type="simple" xlink:href="https://pmi.spmi.ru/pmi/article/view/15122">https://pmi.spmi.ru/pmi/article/view/15122</self-uri>
      <abstract xml:lang="ru">
        <p>Эта теорема весьма просто разрешает задачу, которую можно следующим образом формулировать как задачу элементарной геометрии (см. статью). Несмотря на всю простоту решения ее как задачи, в системе кругов она едва ли разрешима на основании теорем элементарной геометрии. Понятно, что эту теорему можно непосредственно перенести в систему шаров, заменив в ней слова "круг“ словами "шар". Для доказательства же достаточно принять централь Q R за ось вращения. Таким образом в самом общем виде разрешается и задача нахождения центров сферотерций шаров, которая раньше была разрешена посредством формул.</p>
      </abstract>
      <abstract xml:lang="en">
        <p>This theorem very simply resolves a problem which can be formulated as follows as a problem of elementary geometry (see the article). Despite all the simplicity of its solution as a problem within the system of circles, it would hardly be solvable on the basis of the theorems of elementary geometry. It is clear that this theorem can be directly transferred to the system of spheres, replacing in it the words "circle" with the words "sphere". For the proof, it suffices to take the center line Q R as the axis of rotation. Thus, in its most general form, the problem of finding the centers of spherothertions of spheres is also solved, a problem which was previously solved by means of formulas.</p>
      </abstract>
    </article-meta>
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