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Proof of `Deleting high-degree vertices in an independent blow-up` (1st statement)

groundedproofs/Lax263307Proofs/BlowUpDeletion.lean · lax-263307

What this proof establishes

Assuming the claims on the left, the claim on the right holds — checked by the archive's pipeline. Proof code is not displayed here.

Read the Lean proof on GitHub

Description

Every nonisolated survivor belongs to a fibre of size at most ss: a surviving neighbor has degree at least that fibre size. Embed these survivors into the uniform ss-fold blow-up, pull back its lifted decomposition, insert the isolated survivors in singleton bags, and add the removed vertices to every bag.

Attribution

Bonnet–Chang, proof of Lemma 16.