DIFFUSIONCORE◉ LIVE LAB
SIR Contagion
Susceptible–Infected–Recovered with an R0 tipping point. Same math for flu and pop-star fever.
How it works
- Split the crowd into S, I, R; infections need S×I meetings.
- R₀ = spread speed × contact × duration; above 1 it takes off.
- Recovered stock is a firewall — herd immunity is just math.
Use → Epidemics, memes, outages. Push R below 1 or segment the network.
Watch out → Treating R₀ as a property of the germ alone — behavior moves it daily.
Try it → Halve contacts in the lab and watch the peak collapse.
REDCAPE jobs → Explain · Predict · Act · Explore
Free sources → ryansmcgee/seirsplus (MIT) • open-sir/open-sir (MIT) • complexity-explorables.org
INTERACTIVE LABoriginal recreation — poke it
PEAK SICK
23%
PEAK DAY
34
EVER INFECTED
89%
Above 1 it takes off — halve contacts (R₀) and watch the peak collapse.
Attach to a lattice — combines with
Different families, shared jobs. Disagreement between them is where insight lives.
DYNAMICS
Markov Chain
Next state depends only on now. Run it forward to get the long-run mix.
SHARED JOBS: PREDICT · ACT · EXPLORE
GROWTHCapital Share (r > g)
When returns on capital outrun growth, wealth concentrates without any villain.
SHARED JOBS: EXPLAIN · ACT
DISTRIBUTIONSEntropy & Uncertainty
Entropy scores surprise: equilibrium, cyclic, random and complex outcomes sit at different levels of uncertainty.
SHARED JOBS: EXPLAIN · PREDICT