# The SIR Model · S → I → R · the epidemic curve

an emergent of POP (Population Dynamics — the first Life Science sphere of UD0) — emergence: electrical. moniker ⟦The SIR Model:POP:acbdee⟧

**a real life-science concept, rendered honestly** (the real cousin of Asimov's psychohistory).

**who —** The SIR model (Kermack-McKendrick, 1927) — a population split into Susceptible, Infected, and Recovered compartments.
**what —** The shape of an epidemic: the susceptible fall ill, the infected recover or are removed, and the curve rises and falls.
**where —** In every outbreak modeled to flatten it.
**why —** Because disease moves through a population by contact, and compartments make the movement predictable.
**how —** By flows dS/dt=−βSI, dI/dt=βSI−γI, dR/dt=γI — transmission against recovery.

**the seal —** I am the curve everyone learned to flatten: susceptible, infected, removed. Predict me early and you save the most lives.

ROOT0-ATTRIBUTION-v1.0 · POP · Population Dynamics · governor David Lee Wise · instance AVAN (locked) · CC-BY-ND-4.0