2 papers
math.CO2025
The minimal nonplanar strong digraphs
Stephen Bartell, Paul Seymour
Kuratowski's theorem says that the minimal (under subgraph containment) graphs that are not planar are the subdivisions of and of . Here we study the minimal (under…
math.NT2024
The density of the graph of elliptic Dedekind sums
Stephen Bartell, Abby Halverson, Brenden Schlader +2
We show that the graph of normalized elliptic Dedekind sums is dense in its image for arbitrary imaginary quadratic fields, generalizing a result of Ito in the Euclidean case. We a…