On the uniqueness of endemic equilibria of an HIV/AIDS transmission model for a heterogeneous population.

@article{Lin1991OnTU,
  title={On the uniqueness of endemic equilibria of an HIV/AIDS transmission model for a heterogeneous population.},
  author={Xiao-Song Lin},
  journal={Journal of mathematical biology},
  year={1991},
  volume={29 8},
  pages={779-90}
}
In this paper, we examine an HIV/AIDS transmission model which has been widely used for studying the spread of HIV/AIDS through sexual contact. Some sufficient conditions are obtained for the uniqueness of endemic equilibrium. We also present a two-group model whose no-disease equilibrium is unstable but it has at least three positive endemic equilibria.