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arXiv 1910.03083math.AP
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自然梯度增长椭圆型PDE方程组的先验估计和重数

A priori estimates and multiplicity for systems of elliptic PDE with natural gradient growth

Gabrielle Nornberg, Delia Schiera, Boyan Sirakov

摘要:

我们考虑完全非线性一致椭圆合作系统的二次增长的梯度,如$$ -F_i(x, u_i, Du_i, D^2 u_i)- \langle M_i(x)D u_i, D u_i \rangle =λc_{i1}(x) u_1 + \cdots + λc_{in}(x) u_n +h_i(x), $$ $i=1,\cdots,n$,在有界$C^{1,1}$域$Ω\subset \mathbb{R}^N$与Dirichlet边界条件;这里$n\geq 1$,$λ\in\mathbb{R}$,$c_{ij},\, h_i \in L^\infty(Ω)$,$c_{ij}\geq 0$,$M_i$满足$0<μ_1 I\leq M_i\leq μ_2 I$,和$F_i$是一个一致椭圆Isaacs操作。我们得到统一的先验界的系统,弱耦合假设下,似乎是最佳的。作为应用,我们还建立了这些系统的存在性和多重性的结果,包括分支的解决方案,这是新的,即使在标量的情况下。

英文摘要:

We consider fully nonlinear uniformly elliptic cooperative systems with quadratic growth in the gradient, such as $$ -F_i(x, u_i, Du_i, D^2 u_i)- \langle M_i(x)D u_i, D u_i \rangle =λc_{i1}(x) u_1 + \cdots + λc_{in}(x) u_n +h_i(x), $$ for $i=1,\cdots,n$, in a bounded $C^{1,1}$ domain $Ω\subset \mathbb{R}^N$ with Dirichlet boundary conditions; here $n\geq 1$, $λ\in\mathbb{R}$, $c_{ij},\, h_i \in L^\infty(Ω)$, $c_{ij}\geq 0$, $M_i$ satisfies $0<μ_1 I\leq M_i\leq μ_2 I$, and $F_i$ is an uniformly elliptic Isaacs operator. We obtain uniform a priori bounds for systems, under a weak coupling hypothesis that seems to be optimal. As an application, we also establish existence and multiplicity results for these systems, including a branch of solutions which is new even in the scalar case.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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