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Adjacency matrices of polarity graphs and of other C4-free graphs of large size

机译:极性图和其他大尺寸C4无图的邻接矩阵

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摘要

In this paper we give a method for obtaining the adjacency matrix of a simple polarity graph G_q from a projective plane PG(2, q), where q is a prime power. Denote by ex(n: C4) the maximum number of edges of a graph on n vertices and free of squares C4. We use the constructed graphs G_q to obtain lower bounds on the extremal function ex(n; C_4), for some n < q~2 + q + 1. In particular, we construct a C_4-free graph on n = q~2 - q~(1/2) vertices and 1/2q(q~2 - 1) - 1/2 q~(1/2)(q - 1) edges, for a square prime power q.
机译:在本文中,我们提供了一种从投影平面PG(2,q)获得简单极性图G_q的邻接矩阵的方法,其中q是素数。用ex(n:C4)表示图在n个顶点上的最大边数,并且不包含正方形C4。对于某些n

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  • 来源
    《Designs, Codes and Crytography》 |2010年第3期|p.221-233|共13页
  • 作者单位

    Dipartimento di Matematica, Universita degli Studi della Basilicata, Viale dell'Ateneo Lucano, 85100 Potenza, Italy;

    Departament de Matematica Aplicada III, Universitat Politecnica de Catalunya, Campus Nord, Edifici C2, C/ Jordi Girona 1 i 3,08034 Barcelona, Spain;

    Dipartimento di Matematica, Politecnico di Bari, 70123 Bari, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    adjacency; matrix; polarity; size;

    机译:邻接;矩阵;极性;尺寸;

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