Combinatorics Seminar

Optimal point sets determining few distinct triangles

Hazel Brenner, Cornell University

Thursday, September 9th, 2021
5:00 PM - 6:00 PM
Hylan 1106A and zoom (573 239 4086)

What is the greatest number of points that only determine one distinct triangle and what configurations of such points are possible? What if we consider n distinct triangles in d dimensions? It turns out we can construct unique answers to this question when n = 1; 2 for d > 2, with much of the work being done purely combinatorially without reference to dimension or, in fact, a metric at all. In future work, we are hopeful that the combinatorial framework developed in these proofs can be used to make some simplifications to the general problem. The development of these proofs takes us on a tour of Erd}os problems, finite metric spaces, basic graph theory, high school geometry, and an obscure enumerative combinatorics paper from the 1950s.

Please note that this is a hybrid talk. The speaker will present in Hylan 1106A, and the talk will also be broadcast on zoom (573 239 4086).

Event contact: iosevich at gmail dot com