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SINGULAR SOLUTIONS OF A NONLINEAR EQUATION IN A PUNCTURED DOMAIN OF R~2

机译:R〜2刺破域中非线性方程的奇异解

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摘要

We consider the following singular semilinear problem {-Δu(ⅹ) = a(ⅹ)u~σ(ⅹ), x∈Ω{0} (in the distributional sense), u > 0; on Ω{0}, lim|x|→0u(ⅹ)/ln|x| = 0, u(ⅹ) = 0; x∈∂Ω; where σ < 1, Ω is a bounded regular domain in R~2 with 0∈ Ω. The weight function a(ⅹ) is required to be positive and continuous in Ω{0} with the possibility to be singular at x = 0 and/or at the boundary ∂Ω: When the function a satisfies sharp estimates related to Karamata class, we prove the existence and global asymptotic behavior of a positive continuous solution on (Ω){0} which could blow-up at 0.
机译:我们考虑以下奇异的半线性问题{-ΔU(ⅹ)= a(ⅹ)u =σ(ⅹ),x∈ω {0}(在分布意义上),U> 0;在ω {0},LIM | x |→0u(ⅹ)/ ln | x | = 0,u(ⅹ)= 0; x∈∂ω;其中Σ<1,ω是R〜2中的有界常规域,0∈Ω。重量函数a(ⅹ)是在ω {0}中的正和连续的,其可能在x = 0且/或边界处是奇异的,当函数a满足与karamata类相关的夏普估计数,我们证明了正连续解决方案的存在和全局渐近行为(ω) {0},其可以在0爆出0。

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