Proof of `Joint distribution of the unary mixer row matrix` (2nd statement)
groundedproofs/Lax342547Proofs/UnaryRowLaw.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
Multiplication by the packed matrix is exactly the formal row map, followed by the linear equivalence flattening its indexed row halves. That equivalence preserves the image dimension.