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Regular version of the site

Article

On a weight system conjecturally related to sl2

European Journal of Combinatorics. 2014. Vol. 41. P. 266-277.
Kulakova E., Lando S., Mukhutdinova T., Rybnikov G.

We introduce a new series Rk, k = 2, 3, 4, ..., of integer valued weight systems. The value of the weight system Rk on a chord diagram is a signed number of cycles of even length 2k in the intersection graph of the diagram.Weshow that this value depends on the intersection graph only. We check that for small orders of the diagrams, the value of the weight system Rk on a diagram of order exactly 2k coincides with the coefficient of ck in the value of the sl2-weight system on the projection of the diagram to primitive elements.