Talk:Nurgaliev's law

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Dynamics of a population number n is described by the Nurgaliev's equation dn/dt=an²-bn. Here "a" is a half of the average probability of a birth of the boy (it is the same for girls) of a potential parent pair within a year, "b" is an average probability of a death of a person within a year. Time t is measured in years. Simplifications: we neglect unfertile younger and older parts of population, a share of the pairs excluded because of the reasons of incest and so forth. The second term is responsible for death rate and has clear and precise sense - in-average-constant distribution of death rate on age scale (babies risk at a birth, middle age risk to get traumatized, old men are ill). It is known from demographers, for example, that the probability of death within the first year of a life is precisely equal to similar