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Now, let's turn the SIR model into equations.
We're doing that one part after the other--first, the recovery.
If I(t) is the number of infectious persons--it's I(t), and R(t) is the number
of recovered persons--it's R(t), so which of these equations makes the most sense.
The derivative of the number of recovered persons with respect to time equals 5 days
times the number of infected persons 1/5 days times the number of infected persons 1/5 days
times the number of recovered persons or minus 1/5 days times the number of infected persons.