# Credits

| Kind | Who | Note |
|---|---|---|
| Author | godosa | |
| Libraries | see [licenses.md](licenses.md) | |
| Tooling | AI assistance (Claude, Anthropic) | engineering tool; statement in README |

## Models and sources

| Source | Used for | Module |
|---|---|---|
| Verhulst 1838 (logistic growth) | growth toward capacity | `demography.py` |
| Allee 1931; Courchamp, Clutton-Brock & Grenfell 1999 (Allee effects) | small groups dwindle | `demography.py` |
| Fisher 1937; Kolmogorov, Petrovsky & Piskunov 1937 (Fisher–KPP wave of advance) | spread as a travelling front | `migration.py` |
| Ammerman & Cavalli-Sforza 1971, 1984 (*The Neolithic Transition and the Genetics of Populations in Europe*) | wave-of-advance speed (~1 km/yr) as a calibration reference | `migration.py` |
| Kot, Lewis & van den Driessche 1996; Clark 1998 (fat-tailed dispersal) | long-distance founder jumps | `migration.py` |
| Fretwell & Lucas 1970 (ideal free distribution); McFadden 1974 (logit choice) | drift toward headroom | `migration.py` |
| Lotka 1925; Volterra 1926 (competition) | races sharing capacity | `demography.py` |
| Kremer 1993, QJE 108(3) (population and technological change); Henrich 2004, American Antiquity 69(2) (demography and cultural evolution) | tech grows with connected population, lost in small isolated groups | `tech.py` |
| Holdridge 1947 (life zones; via worldgen) | habitat predicates | `predicates.py` |
| H3 hexagonal grid (Uber, h3geo.org) | cells and neighbours | `world.py` |
| Background: Epstein & Axtell 1996 (Sugarscape); Axtell et al. 2002, PNAS (Long House Valley) | agent-based comparison in the design spike | — |
| Real canals (Wikipedia articles on Suez, Panama, Kiel, Corinth, Göta, Caledonian, Erie, Welland, Canal du Midi, Grand Canal, Lingqu, Stecknitz, Briare, Fossa Carolina, Diolkos, Xerxes, Canal of the Pharaohs, Volga–Don, White Sea–Baltic, Rhine–Main–Danube, Bridgewater, Manchester Ship Canal) | calibration reference for great works: `docs/reference/canals.md` (planned: sub-project 2) | — |
| Lanchester 1916 | not used yet (planned: war, sub-project 2) | — |
| Turchin 2003; Turchin, Currie, Turner & Gavrilets 2013, PNAS 110(41) | not used yet (planned: polities) | — |
| Wilson 1967/1970; Christaller 1933 | not used yet (planned: trade, settlements) | — |