In this paper we solve partially an open problem raised by B. Ricceri ({\it Bull. London Math. Soc.} 33 (2001) 331-340). Infinitely many solutions for a Neumann problem are obtained through a direct variational approach where the nonlinearity has an oscillatory behaviour at infinity.

### On an open question of Ricceri concerning a Neumann problem

#### Abstract

In this paper we solve partially an open problem raised by B. Ricceri ({\it Bull. London Math. Soc.} 33 (2001) 331-340). Infinitely many solutions for a Neumann problem are obtained through a direct variational approach where the nonlinearity has an oscillatory behaviour at infinity.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/8001
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