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One of the assumptions in the basic SIR model was that the population was mixed homogeneously...

One of the assumptions in the basic SIR model was that the population was mixed homogeneously and therefore all susceptible elements were equal before the disease, however, in reality that does not always happen. Sometimes the geographical region or of different age groups. In the basic model, make the necessary modifications to include the case in which the population is not homogeneous, and perform a complete analysis of the model.

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