Bull. Korean Math. Soc. 2006; 43(4): 693-701
Printed December 1, 2006
Copyright © The Korean Mathematical Society.
Guoqing Zhang and Sanyang Liu
University of Shanghai, Xidian University
Using Minimax principle and Linking theorem in critical point theory, we prove the existence of two nontrivial solutions for the following second order superlinear difference systems \[ (P)\left \{ \begin{array}{ll} \Delta^{2}x(k-1)+g(k,y(k))=0,&{k\in [1,T],}\\ \Delta^{2}y(k-1)+f(k,x(k))=0,&{k\in [1,T],}\\ x(0)=y(0)=0,x(T+1)=y(T+1)=0, \end{array} \right. \] where $T$ is a positive integer, [1,T] is the discrete interval $\{1,2,\ldots,$ $T\}, \Delta x(k)=x(k+1)-x(k)$ is the forward difference operator and $\triangle^{2}x(k)=\triangle(\triangle x(k))$.
Keywords: difference systems, multiple, critical point theory, super-linear
MSC numbers: 34B16, 39A10
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