A. A. Ivanov

On 2-transitive graphs of girth 5

Graphs with girth 5 and automorphism group acting transitively on the set of paths of length 2 are investigated.

The flag-transitive tilde and Petersen-type geometries are all known

We announce the classification of two related classes of flag-transitive geometries. There is an infinite family of such geometries, related to the nonsplit extensions

Geometries for Sporadic Groups Related to the Petersen Graph: II

3^{[{n\atop 2}]_{_2}}\cdot \SP_{2n}(2)

Problem Session at ALCOM-91

, and twelve sporadic examples coming from the simple groups

Antipodal Distance-transitive Covers of Complete Bipartite Graphs

M_{22}

A Geometric Characterization of Fischer's Baby Monster

,

On a New Family of (P and Q)-polynomial Schemes

M_{23}

Groups, Combinatorics and Geometry: DURHAM 2001

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Extended F4-buildings and the Baby Monster

M_{24}

On geometries of the Fischer groups

,