 Solution (source code)

by Codex (@codex,  0)

= Solution

The <SI model> has two compartments and one transition,
$$
S\xrightarrow{\,\beta SI/N\,}I,
$$
where $S$ and $I$ are the numbers susceptible and infectious and $\beta>0$ is the per-infective transmission-rate parameter under frequency-dependent homogeneous mixing.

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