<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE root>
<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="research-article" 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">8341</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>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Nonexistence of Global Solutions of Quasi-linear Backward Parabolic Equations</article-title><trans-title-group xml:lang="ru"><trans-title>Отсутствие глобальных решений для квазилинейных обратных параболических уравнений</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tsegaw</surname><given-names>B B</given-names></name><name xml:lang="ru"><surname>Тсегау</surname><given-names>Бирилеу Белайне</given-names></name></name-alternatives><bio xml:lang="en">Department of Mathematical Analysis and Theory of Functions</bio><bio xml:lang="ru">Кафедра математического анализа и теории функций</bio><email>birilewb@yahoo.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Peoples’ Friendship University of Russia</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2014-02-15" publication-format="electronic"><day>15</day><month>02</month><year>2014</year></pub-date><issue>2</issue><issue-title xml:lang="en">NO2 (2014)</issue-title><issue-title xml:lang="ru">№2 (2014)</issue-title><fpage>11</fpage><lpage>26</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 ©; 2014, Тсегау Б.Б.</copyright-statement><copyright-year>2014</copyright-year><copyright-holder xml:lang="ru">Тсегау Б.Б.</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/8341">https://journals.rudn.ru/miph/article/view/8341</self-uri><abstract xml:lang="en">This paper deals with the nonexistence of global solutions of quasi-linear backward parabolic equations for p-Laplacian operators: ut = −div Dup−2Du + uq−1u, x,t ∈ Ω × (0,∞) with the Dirichlet boundary condition u = 0 on the boundary ∂Ω × (0,∞) and a bounded integrable initial function u(x,0) = u0(x), where Ω is a smoothly bounded domain in ℝN. We also consider this problem in the case of Ω = ℝN.  The problem is analyzed using the test function method, developed by E. L. Mitidieri and S. I. Pohozaev [Mitidieri E., Pohozaev S. I. A Priory Estimates and the Absence of Solutions of Non- linear Partial Diﬀerential Equations and Inequalities // Proceedings of the Steklov Institute of Mathematics, 2001. - Vol. 234, No 3. - 362 p. - (in russian).] It is based on deriving a priory estimates for solutions by an algebraic analysis of the integral form of inequalities with an optimal choice of test functions. With the help of this method, we obtain the nonexistence conditions based on the weak formulation of the problem with test functions of the form: φ(x,t) = ±u±(x,t) + εδφR(x,t),for ε &gt; 0,δ &gt; 0, where u+ and u− are the positive and negative parts of the solution u of the problem respectively and φR is a standard cut-oﬀ function whose support depends on a parameter R &gt; 0.</abstract><trans-abstract xml:lang="ru">Данная статья посвящена отсутствию глобальных решений квазилинейных обратных параболических уравнений для оператора p-Лапласа: ut = −div Dup−2Du + uq−1u, x,t ∈ Ω × (0,∞) с граничным условием Дирихле u = 0 на границе ∂Ω × (0,∞) и интегрируемой начальной функцией u(x,0) = u0(x), где Ω является гладко ограниченной областью в ℝN. Мы также рассмотрим эту задачу в случае Ω = ℝN.  Проблема анализируется с использованием метода пробных функций, разработанного Э. Л. Митидиери и С. И. Похожаевым [Митидиери Э., Похожаев С. И. Априорные оценки и отсутствие решений нелинейных уравнений и неравенств в частных производных // Тр. МИАН. - М.: Наука, 2001. - Т. 234, No 3. - 362 с.]. Он основан на получении априорных оценок для решений путём алгебраического анализа интегральной формы неравенства с оптимальным выбором пробных функций. С помощью этого метода мы получаем условия отсутствия решений, основанные на слабой постановке задачи с пробными функциями вида φ(x,t) = ±u±(x,t) + εδφR(x,t)при ε &gt; 0,δ &gt; 0, где u+ и u− являются положительной и отрицательной частями решения u задачи, а φR - стандартная срезающая функция, носитель которой зависит от параметра R &gt; 0.</trans-abstract><kwd-group xml:lang="en"><kwd>Quasi-linear backward parabolic equations</kwd><kwd>p-Laplacian operators</kwd><kwd>test function method</kwd><kwd>apriori estimates and nonexistence of global solutions</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>квазилинейные обратные параболические уравнения</kwd><kwd>оператор p-Лапласа</kwd><kwd>метод пробных функций</kwd><kwd>априорные оценки и отсутствие глобальных решений</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Митидиери Э., Похожаев С. И. Априорные оценки и отсутствие решений нелинейных уравнений и неравенств в частных производных // Тр. МИАН. - М.: Наука, 2001. - Т. 234, № 3. - 362 с.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Gong-ming W., Zu-chi C. Nonexistence of Global Positive Solutions for Quasi-Linear Parabolic Inequalities // Jou. Univ. Sc. &amp; Tech. China. - 2004. - Vol. 34, No 3. - Pp. 2903-2916.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Ma L. Blow - Up for Semi-Linear Parabolic Equations with Critical Sobolev Exponent // Pure and Applied Analysis. - 2013. - Vol. 12, No 2. - Pp. 1103-1110. - doi:10.3934/cpaa.2013.12.1103.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Fila M., Souplet P. The Blow-Up Rate for Semi-Linear Parabolic Problems on General Domains. - Basel: Birkhauser Verlag, 2001. - Vol. 8, Pp. 473-480.</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>Gazzola F., Weth T. Finite Time Blow-Up and Global Solutions for Semilinear Parabolic Equations with Initial Data at High Energy Level // Differential and Integral Equations. - 2005. - Vol. 18, No 9. - Pp. 961-990.</mixed-citation></ref><ref id="B6"><label>6.</label><mixed-citation>Pohozaev S. Blow-Up of Global Sign-Changing Solutions of a Nonlinear Heat Equation // Doklady Mathematics. - 2012. - Vol. 85, issue 2. - Pp. 225-228.</mixed-citation></ref><ref id="B7"><label>7.</label><mixed-citation>Polacik P., Quittner P. A Liouville-Type Theorem and the Decay of Radial Solutions of a Semilinear Heat Equation // Nonlinear Anal. - 2006. - Vol. 64. - Pp. 1679-1689.</mixed-citation></ref><ref id="B8"><label>8.</label><mixed-citation>Souplet P. An Optimal Liouville-Type Theorem for Radial Entire Solutions of the Porous Medium Equation with Source // J. Differential Equations. - 2009. - Vol. 246. - Pp. 3980 - 4005.</mixed-citation></ref><ref id="B9"><label>9.</label><mixed-citation>Galaktionov V., Vazquez J. L. Extinction for a Quazilinear Heat Equation with Absorption // Comm. PDE. - 1994. - Vol. 19. - Pp. 1075-1106.</mixed-citation></ref><ref id="B10"><label>10.</label><mixed-citation>Caristi G., Mitidieri E. Existence and Nonexistence of Global Solutions of Higher-Order Parabolic Problem with Slow Decay Initial Data // J. Math. Anal. Appl. - 2003. - Vol. 279. - Pp. 710-722.</mixed-citation></ref><ref id="B11"><label>11.</label><mixed-citation>Gazzola F., Grunau H. C. Global Solutions for Superlinear Parabolic Equations Involving the Biharmonic Operator for Intial Data with Optimal Slow Decay // Calculus of Variations. - 2007. - Vol. 30. - Pp. 389-415.</mixed-citation></ref><ref id="B12"><label>12.</label><mixed-citation>Sun F. Life Span of Blow-Up Solutions for Higher-Order Semilinear Parabolic Equations // Electronic Journal of Differential Equations. - 2010. - Vol. 17. - Pp. 1-9. - http://ejde.math.txstate.edu.</mixed-citation></ref><ref id="B13"><label>13.</label><mixed-citation>Guedda M., Kirane M. Local and Global Nonexistence of Solutions to Semilinear Evolution Equations // Electronic Journal of Differential Equations. - 2002. - Vol. 9. - Pp. 149-160. - http://ejde.math.swt.edu.</mixed-citation></ref><ref id="B14"><label>14.</label><mixed-citation>G. Cai H. P., Xing R. A Note on Parabolic Liouville Theorems and Blow-Up Rates for a Higher-Order Semilinear Parabolic System // International Journal of Differential Equations. - 2011. - Vol. 2011. - Pp. 1-9. - doi:10.1155/2011/ 896427.</mixed-citation></ref><ref id="B15"><label>15.</label><mixed-citation>Zubelevich O. On Weakly Nonlinear Backward Parabolic Problem // International Journal of Differential Equations. - 2009. - Pp. 9-28. - http://www.ma.utexas.edu/mp_arc/c/09/09-28.pdf.</mixed-citation></ref></ref-list></back></article>
