Guus Regts explores the links between certain graph parameters and the invariant theory of the orthogonal group and some of its subgroups. These links are given through so-called ‘partition functions of edge-colouring models’. The partition functions can be seen as graph parameters as well as polynomials that are invariant under a natural action of the orthogonal group.
G. Regts, Graph Parameters and Invariants of the Orthogonal Group.
Prof. A. Schrijver
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