**Sılvia Cuadrado**

Universitat Autònoma de Barcelona

A way of modelling biological evolution
consists in considering densities of individuals with respect to
evolutionary variables. This gives rise to selection mutation
equations. We study the existence of stationary solutions of these
equations and also their behavior when the mutation is small. The
technics mainly involve positive semigroup theory and the infinite
dimensional version in Banach lattices of the Perron Frobenius
theorem.

2005-05-23