Basic and degenerate pregeometries

Michael Giudici, Cai Heng Li, Geoffrey Pearce +1

We study pairs $(\Gamma ,G)$, where $\Gamma$ is a 'Buekenhout-Tits' pregeometry with all rank 2 truncations connected, and $G⩽\mathrm{Aut}\Gamma$ is transitive on the set of elements of e…