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- W2964284431 abstract "Abstract Let ${mathbf{A}}$ be a symmetric convex quadratic form on ${mathbb{R}^{Nn}}$ and Ω $subset$ $mathbb{R}^{n}$ a bounded convex domain. We consider the problem of existence of solutions u : Ω $subset$ $mathbb{R}^{n}$ $to$ $mathbb{R}^{N}$ to the problem ${}left{begin{aligned} displaystylesum_{beta=1}^{N}sum_{i,j=1}^{n}% mathbf{A}_{alpha ibeta j}D^{2}_{ij}u_{beta}&displaystyle=f_{alpha}&&% displaystyletext{in }Omega, displaystyle u&displaystyle=0&&displaystyletext{on }partialOmega,end{% aligned}right.phantom{}}$ when ${fin L^{2}(Omega,mathbb{R}^{N})}$ . Problem (1) is degenerate elliptic and it has not been considered before without the assumption of strict rank-one convexity. In general, it may not have even distributional solutions. By introducing an extension of distributions adapted to (1), we prove existence, partial regularity and by imposing an extra condition uniqueness as well. The satisfaction of the boundary condition is also an issue due to the low regularity of the solution. The motivation to study (1) and the method of the proof arose from recent work of the author [10] on generalised solutions for fully nonlinear systems." @default.
- W2964284431 created "2019-07-30" @default.
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- W2964284431 date "2016-07-01" @default.
- W2964284431 modified "2023-09-27" @default.
- W2964284431 title "On linear degenerate elliptic PDE systems with constant coefficients" @default.
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- W2964284431 doi "https://doi.org/10.1515/acv-2015-0004" @default.
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