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Published online by Cambridge University Press:  01 May 2008

Dept. of Mathematics, National Technical University, Athens, Greece e-mail:
Dept. of Mathematics, University of Aveiro, Portugal e-mail:
*The corresponding author.
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We consider a nonlinear Dirichlet problem driven by the p(ċ)-Laplacian. Using variational methods based on the critical point theory, together with suitable truncation techniques and the use of upper-lower solutions and of critical groups, we show that the problem has at least three nontrivial solutions, two of which have constant sign (one positive, the other negative). The hypotheses on the nonlinearity incorporates in our framework of analysis, both coercive and noncoercive problems.


Research Article
Copyright © Glasgow Mathematical Journal Trust 2008



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