摘要
通过变分方法和分析技巧,得到了非二次的椭圆问题{-Δu+a(x)u=f(x,u)u∈Ωu=0u∈Ω(1)的非平凡解的存在性:定理1假设f(x,t)满足如下条件:(f1)F|(xt|,2t)→+∞(|t|→+∞),F|(tx|,2t)0(|t|0)在Ω上一致成立;(f2)存在a1>0,1<s<NN-+22,使得|f(x,t)|≤a1(1+|t|s)对所有的(x,t)∈Ω×R成立;(f3)存在常数β>N2+N2s-1,a2>0,L>0,使得tf(x,t)-2F(x,t)≥a2|t|β对所有的|t|≥L,x∈Ω成立.如果0是-Δ+a的一个特征值(Dirichlet边界条件)且满足条件:(f4)存在δ>0,使得(i)F(x,t)≥0,对所有的|t|≤δ,x∈Ω;或者(ii)F(x,t)≤0,对所有的|t|≤δ,x∈Ω.则问题(1)有至少一个非平凡解.
We study the existence of a nontrivial solution for the Dirichlet problem where Ω is a smooth bounded domainin R^N.
Theorem 1 Assume that f(.r, t) satisfies the following conditions:
(f1)F(x.t,)/|t|^2→+∞ as |t|→+∞ and F(x,t)|t|^2→ 0 as |t|→0 uniformly on Ω.
(f2) There exist a1 〉 0 and 1 〈 s 〈N+2/N-2 such that | f(x, t) |≤ a1 (1 +| t |^s) for all (x, t) ∈ Ω× R.
(f3) There are constants β〉2N/N+2^s-1, a2〉0 and L〉0 such that tf(x,t)-2F(x,t)≥22|t|^β for all |t|≥L and x ∈ Ω.
If 0 is an eigenvalue of -△+a( with Dirichlet boundary condition ) and also satisties the condition that;
(f4) There exists δ〉0 such that
(i)F(x,t)≥0,for all |t|≤δ,x∈Ω;or(ii) F(x,t)≤0,for all |t|≤δ,x∈Ω, then problem (1) has at least one nontrivial solution.
出处
《西南大学学报(自然科学版)》
CAS
CSCD
北大核心
2009年第2期14-19,共6页
Journal of Southwest University(Natural Science Edition)
基金
国家自然科学基金资助项目(10771173)