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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Discrete and Continuous Models and Applied Computational Science</journal-id><journal-title-group><journal-title xml:lang="en">Discrete and Continuous Models and Applied Computational Science</journal-title><trans-title-group xml:lang="ru"><trans-title>Discrete and Continuous Models and Applied Computational Science</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2658-4670</issn><issn publication-format="electronic">2658-7149</issn><publisher><publisher-name xml:lang="en">Peoples' Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">8284</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Multi-level LP-Structures in Rewriting Systems</article-title><trans-title-group xml:lang="ru"><trans-title>Многоуровневые LP-структуры в системах переписывания</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Makhortov</surname><given-names>S D</given-names></name><name xml:lang="ru"><surname>Махортов</surname><given-names>Сергей Дмитриевич</given-names></name></name-alternatives><bio xml:lang="en"> ; Voronezh State University</bio><bio xml:lang="ru">Факультет прикладной математики, информатики и механики; Воронежский государственный университет</bio><email>sd@expert.vrn.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Voronezh State University</institution></aff><aff><institution xml:lang="ru">Воронежский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2010-02-02" publication-format="electronic"><day>02</day><month>02</month><year>2010</year></pub-date><issue>2.2</issue><issue-title xml:lang="en">NO2.2 (2010)</issue-title><issue-title xml:lang="ru">№2.2 (2010)</issue-title><fpage>19</fpage><lpage>23</lpage><history><date date-type="received" iso-8601-date="2016-09-08"><day>08</day><month>09</month><year>2016</year></date></history><permissions><copyright-statement xml:lang="ru">Copyright ©; 2010, Махортов С.Д.</copyright-statement><copyright-year>2010</copyright-year><copyright-holder xml:lang="ru">Махортов С.Д.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/miph/article/view/8284">https://journals.rudn.ru/miph/article/view/8284</self-uri><abstract xml:lang="en">An algebraic system containing the semantics of a set of rules of the conditional equational theory (or the conditional term rewriting system) is introduced. The following basic questions are considered for the given model: existence of logical closure, equivalent transformations, construction of logical reduction. The obtained results can be applied to analysis and automatic optimization of the corresponding set of rules.</abstract><trans-abstract xml:lang="ru">Вводится алгебраическая система, содержащая семантику множества правил условной эквациональной теории (или системы переписывания термов). Для данной модели рассматриваются следующие основные вопросы: существование логического замыкания, эквивалентные преобразования, построение логической редукции. Полученные результаты могут применяться для исследования и автоматической оптимизации соответствующего множества правил.</trans-abstract><kwd-group xml:lang="en"><kwd>algebraic system</kwd><kwd>conditional rewriting</kwd><kwd>equivalent transformation</kwd><kwd>logical reduction</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>алгебраические системы</kwd><kwd>системы переписывания</kwd><kwd>эквивалентные преобразования</kwd><kwd>логическое замыкание</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Toyama Y. On Equivalence Transformations for Term Rewrite Systems. In Proceedings of the 1983 and 1984 RIMS Symposia on Software Science and Engineering // Lect. Notes Comput. Sci. - 1986. - Vol. 220. - Pp. 44-61.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Dershowitz N., Okada M., Sivakumar G. Canonical Conditional Rewrite Systems. // Lect. Notes Comput. 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