*Covers and cohomology in finite geometry*

Matthew Brown (University of Adelaide)

In finite geometry we are often interested in "regular" subgeometries of
the geometry. The relationship between the subgeometry and the geometry
itself can sometimes be investigated using covers of the subgeometry and
some associated basic cohomology theory. In this talk I will discuss two
examples of such techniques. The first is characterising the classical
generalized quadrangle *Q(5,q)* by a regular embedding of a classical
subquadrangle *Q(4,q)*. The second is representing generalized
quadrangles with a regular point and their groups.