A discrete-time epidemic SISI model

@article{SKShoyimardonov2021ADE,
  title={A discrete-time epidemic SISI model},
  author={S.K.Shoyimardonov},
  journal={UZBEK MATHEMATICAL JOURNAL},
  year={2021}
}
We consider a discrete-time epidemic SISI model in case when the population size is a constant, so the per capita death rate is equal to per capita birth rate. The evolution operator of this model is a non-linear operator which depends on seven parameters. Reducing it to a quadratic stochastic operator, we prove uniqueness of interior fixed point of the operator and study the limit behavior of the trajectory under some conditions to parameters. 

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