A Quasi Curtis-Tits-Phan theorem for the symplectic group

Details A Quasi Curtis-Tits-Phan theorem for the symplectic group A Quasi Curtis-Tits-Phan theorem for the symplectic group

2008-05-17

arxiv.org/abs/0805.2680v1

Mathematics

Group Theory

Scientific paper

10.1016/j.jalgebra.2007.07.014

We obtain the symplectic group $\SP(V)$ as the universal completion of an amalgam of low rank subgroups akin to Levi components. We let $\SP(V)$ act flag-transitively on the geometry of maximal rank subspaces of $V$. We show that this geometry and its rank $\ge 3$ residues are simply connected with few exceptions. The main exceptional residue is described in some detail. The amalgamation result is then obtained by applying Tits' lemma. This provides a new way of recognizing the symplectic groups from a small collection of small subgroups.

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