ON THE COMBINATORIAL STRUCTURE OF PRIMITIVE VASSILIEV INVARIANTS, III — A LOWER BOUND
Abstract
We prove that the dimension of the space of primitive Vassiliev invariants of degree n grows — as n tends to infinity — faster than for any
. This solves the so-called Kontsevich–Bar–Natan conjecture.
The proof relies on the use of the weight systems coming from the Lie algebra (N). In fact, we show that our bound is — up to a multiplication by a rational function in n — the best possible that one can get with
(N)-weight systems.