Nonexistence of nontrivial weak solutions of some nonlinear inequalities with gradient nonlinearity
Contemporary Mathematics. Fundamental Directions, Partial Differential Equations, Tome 67 (2021) no. 1, pp. 1-13.

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In this article, we modify the results obtained by Mitidieri and Pohozaev on sufficient conditions for the absence of nontrivial weak solutions to nonlinear inequalities and systems with integer powers of the Laplace operator and with a nonlinear term of the form $a(x)\left|\nabla(\Delta^{m}u)\right|^{q}+b(x)|\nabla u|^s.$ We obtain optimal a priori estimates by applying the nonlinear capacity method with an appropriate choice of test functions. As a result, we prove the absence of nontrivial weak solutions to nonlinear inequalities and systems by contradiction.
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V. E. Admasu; E. I. Galakhov; O. A. Salieva. Nonexistence of nontrivial weak solutions of some nonlinear inequalities with gradient nonlinearity. Contemporary Mathematics. Fundamental Directions, Partial Differential Equations, Tome 67 (2021) no. 1, pp. 1-13. http://geodesic.mathdoc.fr/item/CMFD_2021_67_1_a0/

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