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Graduate Student Combinatorics Seminar Sponsored by DIMACS

Ramsey Theory on Infinite Linear Orders

Max Aires

Location:  HLL-701
Date & time: Wednesday, 12 February 2025 at 12:15PM - 1:15PM

Abstract: Everyone knows (hopefully) Ramsey's Theorem that 2-colorings of infinite graphs contain monochromatic subsets. In this talk, we investigate generalizations of this fact to general linear orders. We first discuss operations on linear orders, in particular generalizing general arithmetic (and ordinal arithmetic) to the larger class of all linear orders. Now define alpha->(beta, gamma)^2 as the property that all 2-colorings of graphs on (an order) alpha contain a 0-monochromatic beta or a 1-monochromatic beta. We shall investigate this property and see a number or positive and negative results.