Bart Sevenster

collaborators

3 papers

math.CO2018

Mixed partition functions and exponentially bounded edge-connection rank

Guus Regts, Bart Sevenster

We study graph parameters whose associated edge-connection matrices have exponentially bounded rank growth. Our main result is an explicit construction of a large class of graph pa…

math.CO2018

On the circular chromatic number of a subgraph of the Kneser graph

Bart Litjens, Sven Polak, Bart Sevenster +1

Let $n, k, r$ be positive integers with $n \geq r k$ and $r \geq 2$ . Consider a circle $C$ with~ $n$ points~ $1, \dots, n$ in clockwise order. The $r$ -stable \emph{interlacing graph} $\t…

math.QA2015

On the existence of real R-matrices for virtual link invariants

Guus Regts, Alexander Schrijver, Bart Sevenster

We characterize the virtual link invariants that can be described as partition function of a real-valued R-matrix, by being weakly reflection positive. Weak reflection positivity i…