Title On a rank five geometry of Meixner for the Mathieu Group M(12)
Author Dimitri Leemans
Reference Geom. Dedicata 85(2001), nr. 1/3, 273-281.
Math. Reviews 2002f:51021
Zentralblatt 0989.51007
Abstract We construct a rank five residually connected and firm geometry on which the Mathieu group M(12) acts flag-transitively and residually weakly primitively. The geometry has diagram c.c.c*.c* and orders 1,1,3,1,1. As a corollary, we get that the RWPRI+(IP)_2 rank of M(12) is five.

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