摘要
This paper is a sequel to a previous paper （Yang, Y. and Zhang, J. H. Existence of solutions for some fourth-order boundary value problems with parameters. Nonlinear Anal. 69（2）, 1364-1375 （2008）） in which the nontrivial solutions to the fourthorder boundary value problems were studied. In the current work with the same conditions near infinity but different near zero, the positive, negative, and sign-changing solutions are obtained by the critical point theory, retracting property, and invariant sets.
This paper is a sequel to a previous paper （Yang, Y. and Zhang, J. H. Existence of solutions for some fourth-order boundary value problems with parameters. Nonlinear Anal. 69（2）, 1364-1375 （2008）） in which the nontrivial solutions to the fourthorder boundary value problems were studied. In the current work with the same conditions near infinity but different near zero, the positive, negative, and sign-changing solutions are obtained by the critical point theory, retracting property, and invariant sets.
基金
Project supported by the National Natural Science Foundation of China (No. 10871096)
the Foun-dation of Major Project of Science and Technology of Chinese Education Ministry (No. 205056)
the Project of Graduate Education Innovation of Jiangsu Province (No. CX09B_284Z)
the Foundation for Outstanding Doctoral Dissertation of Nanjing Normal University
the Foundation for Young Teachers of Jiangnan University (No. 2008LQN008)
