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math.CO2025
Separating dots with circles
James Beyer, Jaewon Min, Greg Muller
Given a finite set of points in general position in the plane or sphere, we count the number of ways to separate those points using two types of circles: circles through three of t…
math.CO2023
A short proof of the finiteness of Dynkin friezes
Greg Muller
We give a short and elementary proof that every Dynkin diagram admits finitely many (positive integral) friezes. This was originally proven by Gunawan-Muller using the geometry of…