  The Escalator Boxcar Train method (EBT) is a numerical method for structured
population models of McKendrick-von Foerster type. Those models consist of a
certain class of hyperbolic partial differential equations and describe time
evolution of the distribution density of the structure variable describing a
feature of individuals in the population. The method was introduced in late
eighties and widely used in theoretical biology, but its convergence was proven
only in recent years using the framework of measure-valued solutions. Till now
the EBT method was developed only for scalar equation models. In this paper we
derive a full numerical EBT scheme for age-structured, two-sex population model
(Fredrickson-Hoppensteadt model), which consists of three coupled hyperbolic
partial differential equations with nonlocal boundary conditions. It is the
first step towards extending the EBT method to systems of structured population
equations.
