Official Mathlib source

Nat.sum_four_squares

This declaration comes from Mathlib. Follow the official immutable link below to inspect the exact upstream source; ProofAtlas does not mirror or claim authorship of it.

Exact upstream reference

Package: mathlib
Repository: https://github.com/leanprover-community/mathlib4
Commit: 5e932f97dd25535344f80f9dd8da3aab83df0fe6
Source path: Mathlib/NumberTheory/SumFourSquares.lean:199
SHA-256: sha256:1bc309254aa0aabc39c9802eb6ec2358468f7b4d4cf13efdde8888995558eb4a
Verified bytes: 10,569

Open source in Mathlib

Why there is no source download here

ProofAtlas links to the official immutable Mathlib source. It does not mirror the Lean file, relicense upstream work, publish a ProofAtlas source archive, or claim a first-party source footprint.