Edge-reflection positivity and weighted graph homomorphisms

  title={Edge-reflection positivity and weighted graph homomorphisms},
  author={Guus Regts},
  journal={J. Comb. Theory, Ser. A},
B. Szegedy [Edge coloring models and reflection positivity, Journal of the American Mathematical Society 20 (2007) 969–988] showed that the number of homomorphisms into a weighted graph is equal to the partition function of a complex edge-coloring model. Using some results in geometric invariant theory, we characterize for which weighted graphs the edge… CONTINUE READING