The Benjamin Gompertz reference article from the English Wikipedia on 24-Apr-2004
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Benjamin Gompertz

Benjamin Gompertz (March_5. 1779 - July_14, 1865, London, England), self educated mathematician denied admission to universities since he was Jewish. Fellow of the Royal Society from 1819. Gompertz is today mostly known for his Gompertz' law of mortality, a demograhic model published in 1825. The model can be written in this way:

when represents number of individuals at time t, r the intrinsic growth rate and K number of individuals in equilibrium.

See also:

References

Gompertz, B., (1825). On the Nature of the Function Expressive of the Law of Human Mortality, and on a New Mode of Determining the Value of Life Contingencies. Phil. Trans. Roy. Soc. London 123, pp: 513-585. 1825.