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《Nonlinear Analysis: Theory, Methods & Applications》2003,52(5):1535-1552
In this paper we use an algebraic topological argument due to Bahri and Coron to show how the topology of the domain influences the existence of positive solutions of the following problem involving the bilaplacian operator with the critical Sobolev exponentwhere is a bounded domain of with a smooth boundary . 相似文献
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H. Leszczyński 《Applicable analysis》2013,92(3-4):233-251
We reduce the Cauchy problem for a heat equation with the nonlinear right-hand side which depends on some functionals to an equivalent integral equation. Considering mainly Banach spaces of continuous, bounded and exponentially bounded functions, we give some natural sufficient conditions for the existence and uniqueness of solutions to these equations. We give a counterexample which shows that the Lipschitz condition is, in general, insufficient for the Cauchy problem with unbounded data and with functional dependence to guarantee an existence result 相似文献
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Nakao Hayashi Elena I. Kaikina 《Journal of Mathematical Analysis and Applications》2007,334(2):1400-1425
We study the nonlinear damped wave equation
(0.1) 相似文献
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Mohamed Ben Ayed Khalil El Mehdi 《NoDEA : Nonlinear Differential Equations and Applications》2006,13(4):485-509
This paper is concerned with a biharmonic equation under the Navier boundary condition
, u > 0 in Ω and u = Δu = 0 on ∂Ω, where Ω is a smooth bounded domain in
, n ≥ 5, and ε > 0. We study the asymptotic behavior of solutions of (P
−ε) which are minimizing for the Sobolev quotient as ε goes to zero. We show that such solutions concentrate around a point
x
0 ∈Ω as ε → 0, moreover x
0 is a critical point of the Robin’s function. Conversely, we show that for any nondegenerate critical point x
0 of the Robin’s function, there exist solutions of (P
−ε) concentrating around x
0 as ε → 0. Finally we prove that, in contrast with what happened in the subcritical equation (P
−ε), the supercritical problem (P
+ε) has no solutions which concentrate around a point of Ω as ε → 0.
Work finished when the authors were visiting Mathematics Department of the University of Roma “La Sapienza”. They would like
to thank the Mathematics Department for its warm hospitality. The authors also thank Professors Massimo Grossi and Filomena
Pacella for their constant support. 相似文献
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Zhong Tan 《Journal of Mathematical Analysis and Applications》2002,272(2):480-495
In this paper we consider the existence and asymptotic estimates of global solutions and finite time blowup of reaction-diffusion equation with Lewis function and critical Sobolev exponent. 相似文献
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A nonlinear heat equation with singular initial data 总被引:6,自引:0,他引:6
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Abstract We study a perturbed anisotropic equation without using the knowledge of the limiting problem. This provides a different method
from that introduced by Brézis and Nirenberg [4]. Our arguments use some tools recently developed in [5, 6].
Keywords: Anisotropic critical exponent, Critical level, Compactness, Nehari manifold
Mathematics Subject Classification (2000): 35J25, 35J60, 35J65 相似文献
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J. Chabrowski 《Journal of Mathematical Analysis and Applications》2004,290(2):605-619
In this paper we investigate the solvability of the Neumann problem (1.1) involving the critical Sobolev exponents on the right-hand side of the equation and in the boundary condition. It is assumed that the coefficients Q and P are smooth. We examine the common effect of the mean curvature of the boundary ∂Ω and the shape of the graph of the coefficients Q and P on the existence of solutions of problem (1.1). 相似文献
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Tuan Nguyen Huy 《Applications of Mathematics》2014,59(4):453-472
In this paper, a nonlinear backward heat problem with time-dependent coefficient in the unbounded domain is investigated. A modified regularization method is established to solve it. New error estimates for the regularized solution are given under some assumptions on the exact solution. 相似文献
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The aim of this paper is twofold. First, we initiate a detailed study of the so-called Xs θ spaces attached to a partial differential operator. This include localization, duality, microlocal representation, subelliptic estimates, solvability and Lp (Lq ) estimates. Secondly, we obtain some theorems on the unique continuation of solutions to semilinear second order hyperbolic equations across strongly pseudo-convex surfaces. These results are proved using some new Lp → Lq Carleman estimates, derived using the Xs θ spaces. Our theorems cover the subcritical case; in the critical case, the problem remains open. Similar results hold for higher order partial differential operators, provided that characteristic set satisfies a curvature conditions. 相似文献
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This paper is concerned with the existence of the nontrivial solutions of the following problem:
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We consider the semilinear Schrödinger equation , , where , are periodic in for , 0$">, is of subcritical growth and 0 is in a gap of the spectrum of . We show that under suitable hypotheses this equation has a solution . In particular, such a solution exists if and .
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Kazuhiro Ishige 《Journal of Mathematical Analysis and Applications》2008,344(1):231-237
We consider the existence and nonexistence of positive global solutions for the Cauchy problem,
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In this paper, we study the Dirichlet problem for the implicit degenerate nonlinear elliptic equation with variable exponent in a bounded domain $\Omega \subset \mathbb{R}^{n}$. We obtain sufficient conditions for the existence of a solution without regularization and any restriction between the exponents. Furthermore, we define the domain of the operator generated by posed problem and investigate its some properties and also its relations with known spaces that enable us to prove existence theorem. 相似文献
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Michael Winkler 《Mathematical Methods in the Applied Sciences》2002,25(11):911-925
We consider positive solutions of the Cauchy problem in $\mathbb{R\,}^n$ for the equation $$u_t=u^p\,\Delta u+u^q,\quad p\geq1,\; q\geq 1$$\nopagenumbers\end and show that concerning global solvability, the number q = p + 1 appears as a critical growth exponent. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献