Proof of `Deep chain, link 1 of 9`
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
The first link holds outright.
Proof strategy
One application of the ladder's weakening lemma.
Attribution
Synthetic: written for this benchmark. The mathematics is a one-line divisibility weakening; only the shape of the dependency edges is the point.