J. Aust. Math. Soc.
74 (2003), 145-153
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Daisy structure in Desarguesian projective planes
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M. Gabriela Araujo Pardo
Instituto de Matemáticas, UNAM
Circuito Exterior
Ciudad Universitaria
México 04510 D.F.
México
garaujo@math.unam.mx
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Abstract
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We distribute the points and
lines of  according to a special structure that we call
the daisy structure. This distribution is
intimately related to a special block design
which turns out to be isomorphic
to  . We show a blocking
set of  points
in  that intersects each line in at least two
points and we apply this to find a lower bound
for the heterochromatic number of the projective
plane.
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