Proof of `Joint minus images after exposing several plus frames` (2nd statement)
groundedproofs/Lax342547Proofs/ProductMinusImages.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
Each exposed plus frame leaves a minus injectivity conditioning of cost at most two. Product density and pushforward preserve the resulting 2^k factor on the joint affine image estimate.