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Sponsored Artificial Intelligence: A Modern Approach, Global Edition Artificial Intelligence: A Modern Approach, Global Edition

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J. Llibre

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Open access Sep 2026

An SIS Model with Importation and Removal

The Susceptible–Infectious–Susceptible (SIS) model is a classical model for describing the spread of diseases without permanent immunity and has been studied by many authors. In this paper, we characterize all topologically distinct phase portraits in the Poincaré disc for a particular SIS epidemic model with a constan...

J. Llibre, Hui Zeng · 0 citations

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