Thomas Forster: WQOs and BQOs

Wednesday, September 10 from 3 to 4pm
Room: Math 226
Speaker: Thomas Forster (Cambridge)
Title: WQOs and BQOs – an Introductory Talk

Abstract: A WQO is a transitive reflexive relation with no infinite antichains and no infinite strictly descending chains. In this introductory talk (very few proofs!) for a general mathematical audience i shall try to show some of the many places that WQOs have spread their tentacles into, how they give rise to BQOs, the connections with finite combinatorics (Seymour-Robertson theorem), undecidability results in arithmetic and other fun stuff. I’ll even tell you what the two TLAs stand for.

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