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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…
math.QA2015
On partition functions for 3-graphs
Guus Regts, Alexander Schrijver, Bart Sevenster
A {\em cyclic graph} is a graph with at each vertex a cyclic order of the edges incident with it specified. We characterize which real-valued functions on the collection of cubic c…