Chapter 28 — Matrix Operations

This is the canonical CLRS fourth-edition chapter guide during the migration period.

Current source

Sections 28.1--28.3 are native fourth-edition sections (solving systems of linear equations via LUP decomposition, inverting matrices, and symmetric positive-definite matrices with least-squares approximation), imported directly from Section 28.1, Section 28.2, and Section 28.3. Declarations keep their current namespaces; the third-edition-numbered imports CLRSLean.Chapter_28 and CLRSLean.Chapter_28.Section_28_* forward to these sources.

Coverage boundary

The native sections supply the represented fourth-edition matrix-operations sections (CLRS Theorem 28.1 and Lemmas 28.1--28.2).

See docs/clrs-fourth-edition-map.csv for the section-level mapping and docs/migrations/clrs4.md for compatibility and deprecation policy.