Crate sangha 

Sangha — Sociology Engine

सङ्घ (Sanskrit: community, assembly)

A Rust library for computational sociology: social networks, game theory, group dynamics, population models, opinion dynamics, inequality, coalition formation, collective decision-making, trust, and contagion.

Modules

• network — Social network graphs, Watts-Strogatz, Barabasi-Albert, BFS, centrality
• game_theory — Nash equilibria, prisoner’s dilemma, iterated games
• coordination — N-player public goods, auctions, tragedy of the commons, folk theorem
• coalition — Shapley value, core stability, faction merge/split
• collective — Voting (plurality, Borda, Condorcet), jury theorem, wisdom of crowds
• trust — Trust propagation, reputation aggregation, decay, betrayal
• contagion — Hatfield emotional contagion, SIS dynamics, mood propagation
• opinion — Bounded confidence, echo chambers, consensus
• group — Tuckman stages, social loafing, groupthink
• population — Logistic growth, SIR model, herd immunity
• influence — Conformity, social proof, Bass diffusion
• inequality — Gini coefficient, Lorenz curve

Example

use sangha::population;

// Herd immunity threshold for R0 = 3
let h = population::herd_immunity_threshold(3.0).unwrap();
assert!((h - 2.0 / 3.0).abs() < 1e-10); // ~66.7%

// Gini coefficient of equal distribution
let g = sangha::inequality::gini_coefficient(&[100.0, 100.0, 100.0]).unwrap();
assert!(g.abs() < 1e-10); // perfect equality

Re-exports

pub use error::SanghaError;

Modules

coalition

Coalition game theory — Shapley value, core stability, faction dynamics.

collective

Group decision-making — voting methods, wisdom of crowds, jury theorem.

contagion

Emotional and behavioral contagion — Hatfield model, SIS dynamics, mood propagation.

coordination

Multi-agent coordination — public goods games, auctions, mechanism design.

error

Error types for the sangha sociology engine.

game_theory

Game theory — Nash equilibria, prisoner’s dilemma, evolutionary strategies.

group

Group dynamics — cohesion, social loafing, groupthink, Tuckman stages.

inequality

Inequality — Gini coefficient, Lorenz curve, distribution metrics.

influence

Social influence — conformity, diffusion, social proof.

network

Social networks — graph models, metrics, small-world properties.

opinion

Opinion dynamics — voter model, bounded confidence, polarization.

population

Population dynamics — growth models, epidemiology (SIR).

trust

Trust and reputation — trust propagation, reputation aggregation, decay, betrayal.