On flat extended grids Original Research Article

A family of flat flag-transitive extended grids was constructed in Meixner and Pasini (1993). In fact, those extended grids are instances of the gluing construction described in Buekenhout et al. (1994). They can be obtained by gluing a circular space with 2n points with a dual grid of order (1, 2n − 2). In this paper we shall prove that all flat flag-transitive extended grids but the emi-octahedron can be obtained as gluings in that way.