Solving Factorio Quality
Summary
Solving Factorio Quality explores how the Space Age update adds item quality and shows how to model quality probabilities with transition matrices. The author derives probability transitions for quality tiers, demonstrates how to compose them into T_quality(q) matrices, and explains computing long-term throughput via a system of linear equations solved with Gaussian elimination. He also documents building an interactive calculator tool (factoqual) using Rust and WebAssembly, with a TypeScript frontend, and references open-source tooling such as Factoriolab and VanJS.