Abstract
A dual blocking set is a set of points which meets every blocking set but contains no line. We establish a lower bound for the cardinality of such a set, and characterize sets meeting the bound, in projective and affine planes.
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References
Bruen, A. A., ‘Baer Subplanes and Blocking Sets’, Bull. Amer. Math. Soc. 76 (1970), 342–344.
Cameron, P. J. and Mazzocca, F., ‘Bijections which Preserve Blocking Sets’, Geom. Dedicata 21 (1986), 219–229.
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Cameron, P.J., Mazzocca, F. & Meshulam, R. Dual blocking sets in projective and affine planes. Geom Dedicata 27, 203–207 (1988). https://doi.org/10.1007/BF00151351
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DOI: https://doi.org/10.1007/BF00151351