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math.CO2023
Embedded graph 3-coloring and flows
Caroline Bang, Zdeněk Dvořák, Emily Heath +1
A graph drawn in a surface is a near-quadrangulation if the sum of the lengths of the faces different from 4-faces is bounded by a fixed constant. We leverage duality between color…
math.CO2022
On Sums, Derivatives, and Flips of Riordan Arrays
Caroline Bang, Matias von Bell, Eric Culver +4
We study three operations on Riordan arrays. First, we investigate when the sum of Riordan arrays yields another Riordan array. We characterize the - and -sequences of these…