Uniqueness of AG3(4,2)

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    The simple incidence structure D(A, 2) formed by points and un-ordered pairs of distinct parallel lines of a finite affine plane A = (P,L) oforder n > 2 is a 2 − (n^2, 2n, 2n − 1) design. If n = 3, D(A, 2) is the complementary design of A. If n = 4, D(A, 2) is isomorphic to the geometric design AG3(4, 2) (see [2; Theorem 1.2]). In this paper we give necessaryand sufficient conditions for a 2−(n^2, 2n, 2n−1) design to be of the formD(A, 2) for some finite affine plane A of order n > 4. As a consequencewe obtain a characterization of small designs D(A, 2).
    Lingua originaleEnglish
    pagine (da-a)9-16
    RivistaItalian Journal of Pure and Applied Mathematics
    Stato di pubblicazionePublished - 2004


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