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Formal computations in low-dimensional topology: Links and group presentations. (English) Zbl 0807.55008
Bureš, J. (ed.) et al., The proceedings of the 11th winter school on geometry and physics held in Srní, Czechoslovakia, January 5-12, 1991. Palermo: Circolo Matematico di Palermo, Suppl. Rend. Circ. Mat. Palermo, II. Ser. 30, 125-131 (1993).
The author describes the moduli space of Sullivan models of 2-skeletal spaces and complements of links as quotients of spaces of derivations of finitely generated free Lie algebras $$L$$ by the action of a subgroup of automorphisms of $$L$$. For recall, a 2-skeletal space is a path connected space $$S$$ satisfying $$H^{\geq 3} (S;\mathbb{Q}) = 0$$ and $$\dim H^* (S, \mathbb{Q}) < \infty$$. The paper contains as an application a complete description of the Lie algebras associated to the fundamental groups of complements of two-component links in terms of their Milnor numbers.
For the entire collection see [Zbl 0777.00026].

##### MSC:
 55P62 Rational homotopy theory 57M25 Knots and links in the $$3$$-sphere (MSC2010)