Official Mathlib source

Pell.exists_iff_not_isSquare

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/Pell.lean:388
SHA-256: sha256:ac09716ec72e9d69cc505b7505473a1734408c36178f361155543952aafe86cb
Verified bytes: 29,404

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.