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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">dan</journal-id><journal-title-group><journal-title xml:lang="ru">Доклады Национальной академии наук Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Doklady of the National Academy of Sciences of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8323</issn><issn pub-type="epub">2524-2431</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-8323-2023-67-6-454-459</article-id><article-id custom-type="elpub" pub-id-type="custom">dan-1160</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>МАТЕМАТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICS</subject></subj-group></article-categories><title-group><article-title>Безусловно монотонная и глобально устойчивая разностная схема для уравнения Фишера</article-title><trans-title-group xml:lang="en"><trans-title>Unconditionally monotone and globally stable difference schemes for the Fisher equation</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>Матус</surname><given-names>П. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Matus</surname><given-names>P. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Матус Петр Павлович – член-корреспондент, д-р физ.-мат. наук, профессор, гл. науч. сотрудник.</p><p>Ул. Сурганова, 11, 220072, Минск</p></bio><bio xml:lang="en"><p>Matus Piotr P. – Corresponding Member, D. Sc. (Physics and Mathematics), Professor, Chief Researcher.</p><p>11, Surganov Str., 220072, Minsk</p></bio><email xlink:type="simple">piotr.p.matus@gmail.com</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>Пылак</surname><given-names>Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Pylak</surname><given-names>D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Пылак Дорота – адъюнкт.</p><p>Ал. Raclawickie, 14, 20-950, Люблин</p></bio><bio xml:lang="en"><p>Pylak Dorota – Assistant Professor.</p><p>8, Al. Raclawickie, 20-950, Lublin</p></bio><email xlink:type="simple">dorotab@kul.pl</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт математики Национальной академии наук Беларуси; Католический университет им. Иоанна Павла II г. Люблина</institution></aff><aff xml:lang="en"><institution>Institute of Mathematics of the National Academy of Sciences of Belarus; Institute of Mathematics and Computer Science the John Paul II Catholic University of Lublin</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Католический университет им. Иоанна Павла II г. Люблина</institution></aff><aff xml:lang="en"><institution>Institute of Mathematics and Computer Science the John Paul II Catholic University of Lublin</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>05</day><month>01</month><year>2024</year></pub-date><volume>67</volume><issue>6</issue><fpage>454</fpage><lpage>459</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Матус П.П., Пылак Д., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Матус П.П., Пылак Д.</copyright-holder><copyright-holder xml:lang="en">Matus P.P., Pylak D.</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://doklady.belnauka.by/jour/article/view/1160">https://doklady.belnauka.by/jour/article/view/1160</self-uri><abstract><p>В работе строятся и исследуются безусловно монотонные и глобально устойчивые разностные схемы для уравнения Фишера. Показано, что при определенном выборе входных данных задачи эти схемы наследуют главное свойство устойчивого решения дифференциальной задачи  0 ≤ u(x, t) ≤ 1, (x, t) ∈ QT = {(x, t) : 0 ≤ x ≤ l, 0 ≤ t &lt; +∞}Доказана безусловная монотонность рассматриваемых разностных схем и получена априорная оценка разностного решения в равномерной норме. Устойчивое поведение разностного решения в нелинейном случае имеет место при несколько более жестких ограничениях на входные данные: 0,5 ≤ u0 (x), µ1(t), µ2(t) ≤ 1.</p></abstract><trans-abstract xml:lang="en"><p>In this paper, we construct and study unconditionally monotone and globally stable difference schemes for the Fisher equation. It has been shown that constructed schemes inherit the stability property of the exact solution: 0 ≤ u(x, t) ≤ 1, (x, t) ∈ QT = {(x, t) : 0 ≤ x ≤ l, 0 ≤ t &lt; +∞} for a given input data of the problem. The unconditional monotonicity of the difference schemes is proved and the a priori estimate is obtained in the uniform norm for the difference solution. The stable behavior of the difference solution in the nonlinear case takes place under slightly more stringent constraints on the input data: 0,5 ≤ u0 (x), µ1(t), µ2(t) ≤ 1.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>безусловная монотонность</kwd><kwd>глобальная устойчивость</kwd><kwd>разностная схема</kwd><kwd>уравнение Фишера</kwd></kwd-group><kwd-group xml:lang="en"><kwd>unconditional monotonicity</kwd><kwd>global stability</kwd><kwd>difference scheme</kwd><kwd>Fisher equation</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Колмогоров, А. Н. Исследование уравнения диффузии, соединенной с возрастанием количества вещества, и его применение к одной биологической проблеме / А. Н. Колмогоров, И. Г. Петровский, Н. 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