# Vassilis PapanicolaouWichita State University

## Nonlinear eigenvalue problems (joint work with Paul Newton of the
University of Southern California)

We examine some nonlinear eigenvalue problems inspired by the
nonlinear
Schroedinger equation. We compute asymptotics of the
eigenvalues. We also
discuss a related inverse problem: How to recover the
nonlinearity from the
eigenvalues.