Acta mathematica scientia,Series B ›› 2010, Vol. 30 ›› Issue (1): 113-124.doi: 10.1016/S0252-9602(10)60027-6

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MULTIPLE AND SIGN-CHANGING SOLUTIONS FOR NONLINEAR ELLIPTIC EQUATION WITH CRITICAL POTENTIAL AND CRITICAL PARAMETER

 WANG You-Jun, SHEN Yao-Tian   

  1. School of Mathematical Sciences, South China University of Technology, Guangzhou 510640, China
  • Received:2007-12-29 Online:2010-01-20 Published:2010-01-20
  • Supported by:

    Project supported by the National Science Foundation of China (10471047) and the Natural Science Foundation of Guangdong Province (04020077).

Abstract:

Some embedding inequalities in Hardy-Sobolev space are proved. Furthermore, by the improved inequalities and the linking theorem, in a new k-order Sobolev-Hardy space, we obtain the existence of sign-changing solutions for the nonlinear elliptic equation
\left\{\begin{array}{ll}
\disp        -\Delta_{(k)}u:=-\Delta
u-\frac{(N-2)^2}{4}\frac{u}{|x|^2}-\frac{1}{4}\sum\limits_{i=1}^{k-1}\frac{u}{|x|^2(\ln_{(i)}R/|x|)^2}
=f(x,u),&\quad x\in\Omega, 
 u=0,&\quad x\in\partial\Omega,   \end{array}   \right.
where 0\in \Omega \subset B_a(0)\subset {\Bbb R}^N, N\geq 3, \ln_{(i)}=\prod\limits_{j=1}^i\ln^{(j)},  and R=ae^{(k-1)}, where e^{(0)}=1,  e^{(j)}=e^{e^{(j-1)}} for j\geq 1, \ln^{(1)}=\ln,  \ln^{(j)}=\ln\ln^{(j-1)}  for j\geq 2. Besides, positive and negative solutions are obtained by a variant mountain pass theorem.

Key words: nonlinear elliptic equation, critical potential, linking

CLC Number: 

  • 46E35
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