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n2-sets in a projective plane which determine exactly n2+n lines

Authors:	Alessandro Bichara Gabriele Korchmaros

Affiliation:	(1) Istituto Matematico G. Castelnuovo, Università di Roma, 00100 Roma, Italy;(2) Frankel Leo ut 72, 1023 Budapest, Hungary

Abstract:	In this paper n²-sets, in a projective plane, determining exactly n²+n lines are completely characterized.Research partially supported by G.N.S.A.G.A. (C.N.R.).Paper written while the second author was at the University of Rome supported by a grant within the Italian Hungarian cultural exchange program.

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