Topology Seminar

Echoes of Electromagnetism Found in Number Theory
Event starts on this day

Apr

25

2025

Event starts at this time 2:00 pm – 4:00 pm
In Person (view details)
Featured Speaker(s): Iris Yoon
Cost: Free
Dowker Duality- Applications and New Proofs

Description

I'll discuss some applications of Dowker duality in data analysis. I will then present three short, new proofs of Dowker duality using various poset fiber lemmas. I will introduce modifications of joins and products of simplicial complexes called relational join and relational product complexes. These relational complexes can be constructed whenever there is a relation between simplicial complexes, which includes the context of Dowker duality and covers of simplicial complexes. In this more general setting, I will show that the homologies of the simplicial complexes and the relational complexes fit together in a long exact sequence. If time permits, I'll discuss similar results for profunctors, which are generalizations of relations to categories.

Location

PMA 12.166

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