Official Mathlib source

Finset.all_card_le_biUnion_card_iff_exists_injective

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/Combinatorics/Hall/Basic.lean:116
SHA-256: sha256:dab48f10ac7d10b7190b88f8b7e2447b55be1af098358a9f5318d66c675b2382
Verified bytes: 9,649

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.