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Abstract and Applied Analysis
Volume 2010, Article ID 564363, 10 pages
Research Article

Multiplicity Results for a Perturbed Elliptic Neumann Problem

1Department of Science for Engineering and Architecture (Mathematics Section), Engineering Faculty, University of Messina, 98166 Messina, Italy
2Department of Mathematics of Messina and DIMET, University of Reggio Calabria, 89060 Reggio Calabria, Italy

Received 21 April 2010; Accepted 9 July 2010

Academic Editor: Pavel Drábek

Copyright © 2010 Gabriele Bonanno and Giuseppina D'Aguì. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The existence of three solutions for elliptic Neumann problems with a perturbed nonlinear term depending on two real parameters is investigated. Our approach is based on variational methods.