共查询到20条相似文献,搜索用时 31 毫秒
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《Nonlinear Analysis: Real World Applications》2007,8(1):174-186
We consider the differential equation , where F is a nonlinear operator, with nonlinear boundary conditions. Under appropriate assumptions on and the boundary conditions, the existence of solutions is established. If the problem has a lower solution and an upper solution, then we use a quasilinearization method to obtain two monotonic sequences of approximate solutions converging quadratically to a solution of the equation. 相似文献
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Using the Unified Transform, also known as the Fokas method, the solution of the sine-Gordon equation in the quarter plane can be expressed in terms of the solution of a matrix Riemann–Hilbert problem whose definition involves four spectral functions . The functions and are defined via a nonlinear Fourier transform of the initial data, whereas and are defined via a nonlinear Fourier transform of the boundary values. In this paper, we provide an extensive study of these nonlinear Fourier transforms and the associated eigenfunctions under weak regularity and decay assumptions on the initial and boundary values. The results can be used to determine the long-time asymptotics of the sine-Gordon quarter-plane solution via nonlinear steepest descent techniques. 相似文献
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《Nonlinear Analysis: Real World Applications》2007,8(2):636-645
We consider the differential equation , where is a nonlinear function, with nonlinear boundary conditions. Under appropriate assumptions on and the boundary conditions, the existence of solutions is established. If the problem has a lower solution and an upper solution, then we use a quasilinearization method to obtain two monotonic sequences of approximate solutions converging quadratically to a solution of the equation. 相似文献
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Song Yao 《Stochastic Processes and their Applications》2017,127(11):3465-3511
Given , we study solutions of a multi-dimensional backward stochastic differential equation with jumps (BSDEJ) whose generator may not be Lipschitz continuous in -variables. We show that such a BSDEJ with -integrable terminal data admits a unique solution by approximating the monotonic generator by a sequence of Lipschitz generators via convolution with mollifiers and using a stability result. 相似文献
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Ashfaque H. Bokhari Ahmad Y. Al-Dweik F.D. Zaman A.H. Kara F.M. Mahomed 《Nonlinear Analysis: Real World Applications》2010,11(5):3763-3769
In a recent work Sjöberg (2007, 2008) [1], [2] remarked that generalization of the double reduction theory to partial differential equations of higher dimensions is still an open problem. In this note we have attempted to provide this generalization to find invariant solution for a non linear system of th order partial differential equations with independent and dependent variables provided that the non linear system of partial differential equations admits a nontrivial conserved form which has at least one associated symmetry in every reduction. In order to give an application of the procedure we apply it to the nonlinear (2+1) wave equation for arbitrary function and . 相似文献
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Mitsuhiro Nakao 《Journal of Differential Equations》2018,264(1):134-162
We prove the global existence of weak solution pair to the initial boundary value problem for a system of m-Laplacian type diffusion equation and nonlinear wave equation. The interaction of two equations is given through nonlinear source terms and . 相似文献
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Ibrahim Ekren 《Stochastic Processes and their Applications》2017,127(12):3966-3996
In this article, we adapt the definition of viscosity solutions to the obstacle problem for fully nonlinear path-dependent PDEs with data uniformly continuous in , and generator Lipschitz continuous in . We prove that our definition of viscosity solutions is consistent with the classical solutions, and satisfy a stability result. We show that the value functional defined via the second order reflected backward stochastic differential equation is the unique viscosity solution of the variational inequalities. 相似文献
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《Mathematical and Computer Modelling》2007,45(5-6):553-563
In this paper we study global existence of solutions of a mathematical model for drug transport in tumor multicell spheroids. The model is a free boundary problem of a system of partial differential equations. It contains one nonlinear first-order equation describing the distribution of live tumor cells, and two nonlinear reaction diffusion equations describing the evolution of nutrient concentration and drug concentration, respectively. By using the method of characteristics for first-order equations, the -theory for parabolic equations, the Banach fixed point theorem and the extension method, we prove that this problem has a unique global solution. 相似文献
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