# Structural Causal Model

A structural causal model satisfies the following conditions:

- It is a directed acyclic graph \(G\) with vertices \(X_{1}, \dots, X_{n}\)
- Vertices are observables, and arrows represent direct causation
- Each observable \(X_{i}\) is a density, with independent unexplained random variables \(U_{i}, \dots, U_{n}\).

The structural causal model satisfies the Reichenbach’s principle.