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(2010)ELECTRONIC JOURNAL OF COMBINATORICS.17(1). Mark abstract We classify the arcs in PG(2, q), q odd, which consist of (q + 3)/2 points of a conic C and two points not on te conic but external to C, or (q + 1)/2 points of C and two additional points, at least one of which is an internal point of C. We prove that for arcs of the latter type, the number of points internal to C can be at most 4, and we give a complete classification of all arcs that attain this bound. Finally, we list some computer results on extending arcs of both types with further points.

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Autor: Kris Coolsaet and Heide Sticker



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