Graphs of relations and Hilbert series

Details Graphs of relations and Hilbert series Graphs of relations and Hilbert series

2008-01-19

arxiv.org/abs/0801.3013v1

Journal of Symbolic Computation, V42, no.11-12(2007), 1066-1078

Mathematics

Rings and Algebras

14 pages

Scientific paper

We are discussing certain combinatorial and counting problems related to quadratic algebras. First we give examples which confirm the Anick conjecture on the minimal Hilbert series for algebras given by n generators and n(n-1)/2 relations for n less or equal then 7. Then we investigate combinatorial structure of colored graph associated to relations of RIT algebra. Precise descriptions of graphs (maps) corresponding to algebras with maximal Hilbert series are given in certain cases. As a consequence it turns out, for example, that RIT algebra may have a maximal Hilbert series only if components of the graph associated to each color are pairwise 2-isomorphic.

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