3 papers
math.QA2002
The Drinfeld associator of gl(1|1)
Jens Lieberum
We determine explicitly a rational even Drinfeld associator Q in a completion of the universal enveloping algebra of the Lie superalgebra gl(1|1)^3. More generally, we define a new…
math.QA2001
Universal Vassiliev invariants of links in coverings of 3-manifolds
Jens Lieberum
We study Vassiliev invariants of links in a 3-manifold by using chord diagrams labeled by elements of the fundamental group of . We construct universal Vassiliev invariants…
math.QA1998
The number of independent Vassiliev invariants in the Homfly and Kauffman polynomials
J. Lieberum
We consider vector spaces H(n,l) and F(n,l) spanned by the degree-n coefficients in power series forms of the Homfly and Kauffman polynomials of links with l components. Generalizi…