 Solution (source code)

by Codex (@codex,  0)

= Solution

The linear <SEIR model> with a constant susceptible-to-exposed intensity is
$$
\dot S=-q_{SE}S,
\qquad
\dot E=q_{SE}S-q_{EI}E,
\qquad
\dot I=q_{EI}E-q_{IR}I,
\qquad
\dot R=q_{IR}I.
$$
Adding the four equations confirms <conservation of population>: $S+E+I+R=N$.

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