Ribbon 2-Knots, $1+1=2$, and Duflo's Theorem for Arbitrary Lie Algebras
Dror Bar-Natan,
Zsuzsanna Dancso,
Nancy Scherich
Abstract:We explain a direct topological proof for the multiplicativity of Duflo isomorphism for arbitrary finite dimensional Lie algebras, and derive the explicit formula for the Duflo map. The proof follows a series of implications, starting with "the calculation 1+1=2 on a 4D abacus", using the study of homomorphic expansions (aka universal finite type invariants) for ribbon 2-knots, and the relationship between the corresponding associated graded space of arrow diagrams and universal enveloping algebras. This compl… Show more
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