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Duality for the $\mathfrak{sl}_2$ weight system
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abstract
The $\mathfrak{sl}_2$ weight system, corresponding to the colored Jones polynomial of knots, is one of the the simplest weight system for chord diagrams. Recent works have led to explicit computations of this weight system on chord diagrams with complete and complete bipartite intersection graphs using $\mathfrak{sl}_2$ weight systems on shares, i.e., on chord diagrams on two strands. In this paper, we continue our study of shares. We prove a conjecture by Lando about a duality of values of the $\mathfrak{sl}_2$ weight system on chord diagrams whose intersection graphs are joins of complementary graphs with discrete ones. To achieve this, we introduce the two-colored intersection graph of shares, define the inner product of shares, and use chord-adding operators.
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$\mathfrak{sl}(2)$-weight system does not extend to a graph 4-invariant
The sl(2)-weight system does not extend to a graph 4-invariant; only the specializations c=0, 3/8, 1, −3/32 remain candidates, with explicit or conjectural extensions constructed.
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