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Resolutions of PG(5, 2) with Point-cyclic Automorphism Group

机译:具有点循环自同构群的PG(5,2)的分辨率

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A t-(υ, k, λ) design is a set of υ points together with a collection of its k-subsets called blocks so that all subsets of t points are contained in exactly λ blocks. The d-dimensional projective geometry over GF(q), PG(d, q) is a 2 - (q~d + q~(d-1) + … + q + 1, q + 1, 1) design when we take its points as the points of the design and its lines as the blocks of the design. A 2-(υ, k, 1) design is said to be resolvable if the blocks can be partitioned as R = {R_1, R_2, …, R_s}, where s = (υ - 1)/(k - 1) and each R_i consists of υ/k disjoint blocks. If a resolvable design has an automorphism σ which acts as a cycle of length υ on the points and R~σ = R, then the design is said to be point-cyclically resolvable. The design associated with PG(5, 2) is known to be resolvable and in this paper, it is shown to be point-cyclically resolvable by enumerating all inequivalent resolutions which are invariant under a cyclic automorphism group G = <σ> where σ is a cycle of length 63. These resolutions are the only resolutions which admit a point-transitive automorphism group. Furthermore, some necessary conditions for the point-cyclic resolvability of 2-(υ, k, 1) designs are also given.
机译:t-(υ,k,λ)设计是一组υ点以及其k个子集(称为块)的集合,因此t点的所有子集都包含在精确的λ块中。当GF(q),PG(d,q)上的d维投影几何是2-(q〜d + q〜(d-1)+…+ q + 1,q + 1,1)设计以其要点为设计要点,以其线为设计要点。如果可以将块划分为R = {R_1,R_2,…,R_s},其中s =(υ-1)/(k-1)且2 =(υ,k,1)设计是可以解决的每个R_i由υ/ k个不相交的块组成。如果可解析设计具有自同构σ,该自同构σ充当点上的长度υ的循环,且R〜σ= R,则该设计被称为点循环可解析的。已知与PG(5,2)相关的设计是可解析的,并且在本文中,通过枚举在循环自同构群G = <σ>下所有不变的所有等价分辨率,证明了它可以点循环解析,其中σ为长度为63的循环。这些分辨率是允许点传递自同构组的唯一分辨率。此外,还给出了2-(υ,k,1)设计的点循环可解性的一些必要条件。

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