The exact asymptotic behaviour of the unique solution to a singular nonlinear Dirichlet problem

The exact asymptotic behaviour of the unique solution to a singular nonlinear Dirichlet problem
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奇异非线性狄利克雷问题唯一解的精确渐近行为

DOI:
10.1016/j.jmaa.2006.07.052
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发表时间:
2007-05
期刊:
J. Math. Anal. Appl.
影响因子:
--
通讯作者:
俞建宁
俞建宁
中科院分区:
其他
文献类型:
--
作者:
张志军;俞建宁

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利用Karamata正则变理论、摄动论证和构造比较函数,我们证明了奇异Dirichlet问题- Δu=b(x)g(u)+λ >, u>, x∈Ω, u|∂Ω=0的边界附近唯一解u∈C2(Ω)∩C(Ω¯)的精确渐近行为,并且证明了该问题解的存在唯一性,其中Ω是在RN中具有光滑边界的有界域,λ>0, g∈C1((0,∞),(0,∞),且存在γ>1使得[公式:∀ξ>0, f∈Clocα([0,∞),[0,∞)),函数f(s)s+s0在(0,∞)上递减,且b在Ω上是非负非平凡的,可能在边界上消失。
By Karamata regular varying theory, a perturbed argument and constructing comparison functions, we show the exact asymptotic behaviour of the unique solution u∈C2(Ω)∩C(Ω¯) near the boundary to a singular Dirichlet problem −Δu=b(x)g(u)+λf(u), u>0, x∈Ω, u|∂Ω=0, which is independent on λf(u), and we also show the existence and uniqueness of solutions to the problem, where Ω is a bounded domain with smooth boundary in RN, λ>0, g∈C1((0,∞),(0,∞)) and there exists γ>1 such that [Formula: see text] , ∀ξ>0, f∈Clocα([0,∞),[0,∞)), the function f(s)s+s0is decreasing on (0,∞) for some s0>0, and b is nonnegative nontrivial on Ω, which may be vanishing on the boundary.
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