Proof of `Averaging outside a set of coordinates` (1st statement)
groundedproofs/Lax253009Proofs/FourierProjection.lean · lax-253009
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
Use the triangle inequality for a finite sum and divide by the cube's cardinality.