共查询到20条相似文献,搜索用时 140 毫秒
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该文考虑下列带磁场的多临界非局部椭圆方程■多解的存在性,其中Ω是RN中带光滑边界的有界区域,N≥4,i是虚数单位,2s~*=(N+αs)/(N-2),N-4<αs 0并且2≤p <2~*=2N/(N-2).假定磁向量位势A(x)=(A1(x),A2 (x),…,AN(x))取实值并且满足局部H?lder连续.该文利用Ljusternik-Schnirelman理论证明了当λ较小时,方程(0.1)至少有cat_Ω(Ω)个非平凡解. 相似文献
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1 题目已知椭圆C :x2a2 + y2b2 =1(a >b >0 ) ,F1,F2 是焦点 ,如果C上存在一点P ,使∠F1PF2 =α(0° <α<180°) ,则椭圆离心率的范围是sin α2 ≤e <1.证明 方法 1:设 |PF1| =m ,|PF2 | =n ,∠PF2 F1=θ,则∠PF1F2 =180° - (α +θ) .在△F1PF2 中 ,根据正弦定理得 :msinθ=nsin[180° - (α +θ) ]=2csinα,根据比例性质及诱导公式得m +nsinθ +sin(α +θ) =2csinα.因m +n =2a ,故 2asinθ +sin(α +θ) =2csinα,所以e =ca =sinαsinθ +sin(α +θ)=2sinα·cos α22sin α2 +θcos α2=sin α2sin(α2 +θ)≥sin α2 ,当… 相似文献
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本文应用Morse理论和惩罚性技巧研究了一类半线性椭圆方程在无穷远处和在原点处都共振情形下非平凡解的存在性. 相似文献
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圆锥曲线的离心率是描述曲线形状的一个很重要的量.椭圆的离心率能刻画其扁平程度,而双曲线的离心率反映的是其张口大小的量.由于离心率P分别与椭圆及双曲线的特征量a、b、c有量的直接联系,所以对离心率e的考察在每一次检测中几乎都会出现. 相似文献
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本文对一道关于共焦点的椭圆与双曲线离心率试题进行分析,发现将一个条件改变后,会得到截然不同的结果,然后通过深入思考探究,揭示问题背后的本质,并对其进行推广,得到若干关于共焦点的椭圆与双曲线离心率范围的结论. 相似文献
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利用非光滑临界点理论 ,本文证明了一类临界增长非线性椭圆方程-div(A(x ,u) | u|p-2 u) 1pA′u(x ,u) | u|p =g(x ,u) |u|p -2 u ,u=0 , Ω ; Ω 非平凡正解的存在性 .其中 1
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LetΩR~N be a smooth bounded domain such that 0∈Ω,N≥5,2~*:=(2N)/(N-4) is the critical Sobolev exponent,and f(x) is a given function.By using the variational methods, the paper proves the existence of solutions for the singular critical in the homogeneous problemΔ~u-μu/(|x|~4)=|u|~(2~*-2)u f(x) with Dirichlet boundary condition on Ωunder some assumptions on f(x) andμ. 相似文献
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本文考虑具有临界位势和临界权函数的四维非线性重调和问题,证明非平凡解的存在性. 相似文献
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利用Sobo lev-H ardy不等式和山路引理给出了一类带奇异系数和次临界指数的双调和椭圆型方程Δ2u-μu x s=f(x)uq-1+up-1,u>0,x∈;Ωu=0,x∈Ω非平凡解的存在性结果. 相似文献
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Wei-hua Yang 《应用数学学报(英文版)》2006,22(4):687-702
In this paper, we consider the Neumann boundary value problem for a system of two elliptic equations involving the critical Sobolev exponents. By means of blowing-up method, we obtain behavior of positives with low energy and asymptotic behavior of positive solutions with minimum energy as the parameters λ,μ→∞. 相似文献
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In this paper we are concerned with the Waterloo variant of the index calculus method for the discrete logarithm problem in
. We provide a rigorous proof for the heuristic arguments for the running time of the Waterloo algorithm. This implies in studying the behavior of pairs of coprime smooth polynomials over finite fields. Our proof involves a double saddle point method, and it is in nature similar to the one of Odlyzko for the rigorous analysis of the basic index calculus. 相似文献
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The Global Cauchy Problem for the Critical and Subcritical Nonlinear Schrodinger Equations in Hs 下载免费PDF全文
Baoxiang Wang 《偏微分方程(英文版)》1998,11(2):173-192
In this paper, the local and global existence of solutions for the Cauchy problem of the critical and subcritical nonlinear Schrödinger equations in H^s (s ≥ 2) is studied by using the manner of formal differentiation with respect to time. Some conjectures posed by Cazenave and Weissler in [1] are verified. 相似文献
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Y. Fujita 《Applied Mathematics and Optimization》2000,41(1):1-7
We give a simple proof of the theorem concerning optimality in a one-dimensional ergodic control problem. We characterize
the optimal control in the class of all Markov controls. Our proof is probabilistic and does not need to solve the corresponding
Bellman equation. This simplifies the proof.
Accepted 24 March 1998 相似文献
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