M. Ramos & P. Rodrigues
We prove the existence of a nonzero solution for the fourth order elliptic equation
with boundary conditions . Here, is a real parameter, is superlinear both at zero and infinity and changes sign in . The proof uses a variational argument based on the argument by Bahri-Lions .
Published January 1, 2001.
Math Subject Classifications: 35J25, 35J20, 58E05.
Key Words: Superlinear elliptic problems, Morse index, biharmonic operator.
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