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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 pub-id-type="doi">10.18255/1818-1015-2012-6-127-136</article-id><article-id custom-type="elpub" pub-id-type="custom">mais-147</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>Непрерывное уплощение правильного тетраэдра точными отображениями</article-title><trans-title-group xml:lang="en"><trans-title>Continuous Flattening of a Regular Tetrahedron with Explicit Mappings</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>Ито</surname><given-names>Джин-ичи</given-names></name><name name-style="western" xml:lang="en"><surname>Itoh</surname><given-names>Jin-ichi</given-names></name></name-alternatives><bio xml:lang="ru"><p>профессор факультета образования</p></bio><bio xml:lang="en"><p>профессор факультета образования</p></bio><email xlink:type="simple">j-itoh@kumamoto-u.ac.jp</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>Нара</surname><given-names>Чи</given-names></name><name name-style="western" xml:lang="en"><surname>Nara</surname><given-names>Chie</given-names></name></name-alternatives><bio xml:lang="ru"><p>профессор Образовательного центра свободных искусств</p></bio><bio xml:lang="en"><p>профессор Образовательного центра свободных искусств</p></bio><email xlink:type="simple">cnara@ktmail.tokai-u.jp</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Университет Кумамото</institution><country>Япония</country></aff><aff xml:lang="en"><institution>Kumamoto University</institution><country>Japan</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Токийский университет</institution><country>Япония</country></aff><aff xml:lang="en"><institution>Tokai University</institution><country>Japan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2012</year></pub-date><pub-date pub-type="epub"><day>12</day><month>03</month><year>2015</year></pub-date><volume>19</volume><issue>6</issue><fpage>127</fpage><lpage>136</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ито Д., Нара Ч., 2015</copyright-statement><copyright-year>2015</copyright-year><copyright-holder xml:lang="ru">Ито Д., Нара Ч.</copyright-holder><copyright-holder xml:lang="en">Itoh J., Nara C.</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/147">https://www.mais-journal.ru/jour/article/view/147</self-uri><abstract><p>В статье [<xref ref-type="bibr" rid="cit10">10</xref>] нами доказано, что любой правильный многогранник P допускает непрерывное (изометричное) складывание (или разглаживание) на плоскость. В настоящей статье мы приводим явные формулы непрерывных функций такого процесса складывания для правильного тетраэдра в R³ . Статья публикуется в авторской редакции.</p></abstract><trans-abstract xml:lang="en"><p>We proved in [<xref ref-type="bibr" rid="cit10">10</xref>] that each Platonic polyhedron P can be folded into a flat multilayered face of P by a continuous folding process of polyhedra. In this paper, we give explicit formulas of continuous functions for such a continuous flattening process in R³ for a regular tetrahedron.</p><p>The article is published in the author’s wording.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>непрерывное складывание</kwd><kwd>правильные тетраэдры</kwd><kwd>многогранники</kwd><kwd>складывание бумаги</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Continuous Flattening</kwd><kwd>Regular Tetrahedra</kwd><kwd>Polyhedra</kwd><kwd>Paper Folding</kwd></kwd-group><funding-group><funding-statement xml:lang="en">Grand-in-Aid for Scientific Research (No.23540098), JSPS; Grand-in-Aid for Scientific Research (No.23540160), JSPS</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">A. D. Alexandrov, “ Convex Polyhedra,” Springer-Verlag, Berlin, 2005. Monographs in Mathematics. Translation of the 1950 Russian edition by N. S. Dairbekov, S. S. Kutateladze, and A. B. Sossinsky.</mixed-citation><mixed-citation xml:lang="en">A. D. Alexandrov, “ Convex Polyhedra,” Springer-Verlag, Berlin, 2005. Monographs in Mathematics. Translation of the 1950 Russian edition by N. S. Dairbekov, S. S. Kutateladze, and A. B. Sossinsky.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">T. Banchoff, “Nonrigidity theorem for tight polyhedra,” Arch. Math. 21, 416–423, 1970.</mixed-citation><mixed-citation xml:lang="en">T. Banchoff, “Nonrigidity theorem for tight polyhedra,” Arch. Math. 21, 416–423, 1970.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">D. Bleecker, “Volume increasing isometric deformations of convex polyhedra,” J. Differential Geom. 43, 505–526, 1996.</mixed-citation><mixed-citation xml:lang="en">D. Bleecker, “Volume increasing isometric deformations of convex polyhedra,” J. Differential Geom. 43, 505–526, 1996.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">A. Cauchy, “Sur les polygons et les polyedres,” J. Ecole Polytech. 9, 87, 1813.</mixed-citation><mixed-citation xml:lang="en">A. Cauchy, “Sur les polygons et les polyedres,” J. Ecole Polytech. 9, 87, 1813.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">R. Connelly, “A counterexample to the rigidity conjecture for polyhedra,” Inst. Hautes Etudes Sci. Publ. Math. 47, 333–338, 1978.</mixed-citation><mixed-citation xml:lang="en">R. Connelly, “A counterexample to the rigidity conjecture for polyhedra,” Inst. Hautes Etudes Sci. Publ. Math. 47, 333–338, 1978.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">R. Connelly, “The rigidity of polyhedral surface,” Math. Mag. 52, 275–283, 1979.</mixed-citation><mixed-citation xml:lang="en">R. Connelly, “The rigidity of polyhedral surface,” Math. Mag. 52, 275–283, 1979.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">E. D. Demaine, M. D. Demaine and A. Lubiw, “Flattening polyhedra,” Unpublished manuscript, 2001.</mixed-citation><mixed-citation xml:lang="en">E. D. Demaine, M. D. Demaine and A. Lubiw, “Flattening polyhedra,” Unpublished manuscript, 2001.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">E. D. Demaine and J. O’Rourke, “ Geometric folding algorithms, Lincages, Origami, Polyhedra,” Cambridge University Press, 2007.</mixed-citation><mixed-citation xml:lang="en">E. D. Demaine and J. O’Rourke, “ Geometric folding algorithms, Lincages, Origami, Polyhedra,” Cambridge University Press, 2007.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">K. Hirata, Private communication, 2011.</mixed-citation><mixed-citation xml:lang="en">K. Hirata, Private communication, 2011.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">J. Itoh and C. Nara, “Continuous flattening of Platonic polyhedra,” Proceedings of the international conference “Computational geometry, graphs and applications,” LNCS 7033, 108–121, Springer, 2011.</mixed-citation><mixed-citation xml:lang="en">J. Itoh and C. Nara, “Continuous flattening of Platonic polyhedra,” Proceedings of the international conference “Computational geometry, graphs and applications,” LNCS 7033, 108–121, Springer, 2011.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">J. Itoh, C. Nara and C. Vîlcu, “Continuous flattening of convex polyhedra,” XIV Spanish meeting on computational geometry, EGC 2011 “Computational Geometry,” LNCS 7579, 85–97, Springer, 2012.</mixed-citation><mixed-citation xml:lang="en">J. Itoh, C. Nara and C. Vîlcu, “Continuous flattening of convex polyhedra,” XIV Spanish meeting on computational geometry, EGC 2011 “Computational Geometry,” LNCS 7579, 85–97, Springer, 2012.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">A. Milka, “Linear bendings of regular convex polyhedra,” Matematicheskaya Fizika, Analiz, Geometriya 1, 116–130, 1994.</mixed-citation><mixed-citation xml:lang="en">A. Milka, “Linear bendings of regular convex polyhedra,” Matematicheskaya Fizika, Analiz, Geometriya 1, 116–130, 1994.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">I. Pak, “Inflating the cube without stretching,” Amer. Math. Monthly 115, 443–445, 2008.</mixed-citation><mixed-citation xml:lang="en">I. Pak, “Inflating the cube without stretching,” Amer. Math. Monthly 115, 443–445, 2008.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">I. Sabitov, “The volume of polyhedron as a function of its metric,” Fundam. Prikl. Mat. 2(4), 1235–1246, 1996.</mixed-citation><mixed-citation xml:lang="en">I. Sabitov, “The volume of polyhedron as a function of its metric,” Fundam. Prikl. Mat. 2(4), 1235–1246, 1996.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">I. Sabitov, “The volume as a metric invariant of polyhedra,” Discrete Comput. Geom. 20, 405–425, 1998.</mixed-citation><mixed-citation xml:lang="en">I. Sabitov, “The volume as a metric invariant of polyhedra,” Discrete Comput. Geom. 20, 405–425, 1998.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">I. Sabitov, “On some recent results in the metric theory of polyhedra,” Rend. Circ. Mat. Palermo (2) Suppl. No. 65, part II, 167–177, 2000.</mixed-citation><mixed-citation xml:lang="en">I. Sabitov, “On some recent results in the metric theory of polyhedra,” Rend. Circ. Mat. Palermo (2) Suppl. No. 65, part II, 167–177, 2000.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
