Proof of `Unselected sparse vectors cannot conceal fresh key coefficients`
groundedproofs/Lax342547Proofs/SparseKeyCoefficients.lean · lax-342547
What this proof establishes
no assumptions
Assuming the claims on the left, the claim on the right holds — checked by the archive's pipeline. Proof code is not displayed here.
Description
Adjoin the at most fourteen key labels to the sparse support and extract each fresh key coefficient through the pin quotient. The unselected support contributes zero, and list injectivity isolates the tested key.