Markov Semigroups and Structured Population Dynamics

An irreducible Markov semigroup of which the essential type is strictly negative, has a prescribed asymptotic behaviour. For a class of structured population models, where the number of individuals is conserved, one can associate a Markov semigroup with the corresponding backward equation, estimate the essential type and establish irreducibility, and thus characterize the large time behaviour of the solutions to the problem.