Szukana fraza: [Abstract = "A cellular automaton model is presented in order to describe mutual interactions among the individuals of a population due to social decisions. The scheme is used for getting qualitative results, comparable to field experiments carried out on a population of ants which present an aggregative behavior. We also present a second description of a biological spatially structured population of N individuals by a system of stochastic differential equations of Itô type. A \"law of large numbers\" to a continuum dynamics described by an integro\-differential equation is given."]

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