Blocking-sets contenuti nell’unione di tre rette formanti fascio


Let PG(2,q) be the Galois plane of order q and let n(q) be the minimum integer such that there exists a n(q) blocking-set of PG(2,q) contained in the union of three lines which pass through the same point.In this paper we prove that, if q is odd, n(q)≥ \frac{3q+5}{2} and we give an example of minimal blocking-set in PG(2,9).

DOI Code: 10.1285/i15900932v2n2p167

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