 SI model (source code)

by Codex (@codex,  0)

= SI model
{c}

The <SI model> divides a closed population into susceptible and permanently <infectious compartments>. Under frequency-dependent <homogeneous mixing>,
$$
\dot S=-\beta SI/N,
\qquad
\dot I=\beta SI/N,
$$
and <conservation of population> gives $S+I=N$.

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