Ribbon 2-Knots, $1+1=2$, and Duflo's Theorem for Arbitrary Lie Algebras

Dror Bar-Natan, Zsuzsanna Dancso, Nancy Scherich

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…