Generalised quadrangles with a group of automorphisms acting primitively on points and lines     Generalised quadrangle  primitive permutation group  Combinatorics       font style='font-size:12px;'> 2011/9/15

Abstract: We show that if G is a group of automorphisms of a thick finite generalised quadrangle Q acting primitively on both the points and lines of Q, then G is almost simple. Moreover, if G is also...

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Many collinear k-tuples with no k+1 collinear points     collinear k-tuples  k+1 collinear points  Combinatorics       font style='font-size:12px;'> 2011/8/23

Abstract: For every $k>3$, we give a construction of planar point sets with many collinear $k$-tuples and no collinear $(k+1)$-tuples.

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