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• W2964205941 abstract "If B is a minimal blocking set of size less than 3(q+1)=2 in PG(2,q), q is a power of the prime p, then Szőnyi’s result states that each line meets B in 1 (mod p) points. It follows that B cannot have bisecants, i.e., lines meeting B in exactly two points. If q >13, then there is only one known minimal blocking set of size 3(q+1)=2 in PG(2, q), the so-called projective triangle. This blocking set is of Redei type and it has 3(q-1)=2 bisecants, which have a very strict structure. We use polynomial techniques to derive structural results on Redei type blocking sets from information on their bisecants. We apply our results to point sets of PG(2, q) with few odd-secants. In particular, we improve the lower bound of Balister, Bollobas, Furedi and Thompson on the number of odd-secants of a (q+2)-set in PG(2, q) and we answer a related open question of Vandendriessche. We prove structural results for semiovals and derive the non existence of semiovals of size q+3 when p≠3 and q>5. This extends a result of Blokhuis who classified semiovals of size q+2, and a result of Bartoli who classified semiovals of size q+3 when q ≤ 17. In the q even case we can say more applying a result of Szőnyi and Weiner about the stability of sets of even type. We also obtain a new proof to a result of Gacs and Weiner about (q+t, t)-arcs of type (0, 2, t) and to one part of a result of Ball, Blokhuis, Brouwer, Storme and Szőnyi about functions over GF(q) determining less than (q+3)/2 directions." @default.
• W2964205941 created "2019-07-30" @default.
• W2964205941 creator A5076962307 @default.
• W2964205941 date "2017-01-10" @default.
• W2964205941 modified "2023-09-26" @default.
• W2964205941 title "On Bisecants of Rédei Type Blocking Sets and Applications" @default.
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• W2964205941 doi "https://doi.org/10.1007/s00493-016-3442-6" @default.
• W2964205941 hasPublicationYear "2017" @default.
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