Reaction-diffusion waves of advance in the transition to agricultural economics.
In a previous paper [J. Fort and V. Méndez, Phys. Rev. Lett. 82, 867 (1999)], the possible importance of higher-order terms in a human population wave of advance has been studied. However, only a few such terms were considered. Here we develop a theory including all higher-order terms. Results are in good agreement with the experimental evidence involving the expansion of agriculture in Europe.
Fort
J
J
Departament de Física, Escola Politècnica Superior, Universtitat de Girona, 17071 Girona, Catalonia, Spain.
Méndez
V
V