Discrete symmetry with compact fundamental domain, and geometric simple connectivity - A provisional Outline of work in Progress -

Valentin Poenaru (1)

1 LM-Orsay - Laboratoire de Mathématiques d'Orsay

We show that a certain geometric property, the QSF introduced by S.~Brick and M.~Mihalik, is universally true for {\ibf all} finitely presented groups $\Gamma$. One way of defining this property is the existence of a smooth compact manifold $M$ with $\pi_1 \, M = \Gamma$, such that $\tilde M$ is geometrically simply-connected ({\it i.e.} without handles of index $\lambda = 1$). There are also alternative, more group-theoretical definitions, which are presentation independent. But $\Gamma \in {\rm QSF}$ is not only a universal property, it is quite highly non-trivial too; its very special case for $\Gamma = \pi_1 \, M^3$ (where it means $\pi_1^{\infty} \, \tilde M^3 = 0$) is actually already known, as a corollary of G.~Perelman's big breakthrough on the Geometrization of 3-Manifolds.

Mots clés: Quasi-simply-filtered (QSF); Geometrically simply connected; -\Psi/Phi; Easy group and difficult groups; Functoriality

Domaines: Topologie géométrique [math.GT]

Valentin Poenaru. Discrete symmetry with compact fundamental domain, and geometric simple connectivity - A provisional Outline of work in Progress -. 2007. ⟨hal-00189810⟩