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Resolving Erdős-Ulam Monochromatic Union-Closed Family Conjectures

Deep Bhattacharjee, Priyabrata Mandal and Ushashi Bhattacharya

Published
Source
OpenAlex
Published in
arXiv (Cornell University)
DOI
10.48550/arxiv.2610.02833
Original
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Topics
CombinatoricsGeometric Topology

Abstract

We prove both Erdős-Ulam conjectures on monochromatic union-closed families. Every two-colouring of the subsets of a finite set contains a monochromatic union-closed family whose size grows faster than any fixed power of the size of the set, while suitable colourings admit no monochromatic union-closed family of exponential size. Both results hold for any number of colours and are verified in Lean.

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