SIR: R_0=β/γ; v_c=(β−γ)/β; at R_0=2: v_c=1/2; at R_0=4: v_c=3/4

Layer 3 — Biologyin the epidemiology subtree

Sympy-exact symbolic witness of the SIR basic reproduction number canonical forms and two integer-R_0 herd-immunity anchors. Setup: β, γ, S, N — all positive symbols. Basic reproduction number: R_0 = β/γ (sympy canonical 'beta/gamma'). …

Related concepts

SIR R_0 = β/γ; R_eff = R_0·S/N; herd-immunity v_c = 1 − 1/R_0; dS/dt, dI/dt, dR/dt ODE

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