A note on boundary conditions for nonlinear operators
- Autori: CAPONETTI D; TROMBETTA A; TROMBETTA G
- Anno di pubblicazione: 2008
- Tipologia: Articolo in rivista (Articolo in rivista)
- Parole Chiave: Measure of noncompactness, k-$\psi$-contraction, $\psi$-condensing operator, fixed point index.
- OA Link: http://hdl.handle.net/10447/40013
Abstract
We investigate boundary conditions for strict-$\psi$-contractive and $\psi$-condensing operators. We derive results on the existence of eigenvectors with positive and negative eigenvalues and we obtain fixed point theorems for classes of noncompact opera\-tors.