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Asymptotically approaching the Moore bound for diameter three by Cayley graphs

机译:渐近地接近由Cayley图表直径三的摩尔

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The largest order n(d, k) of a graph of maximum degree d and diameter k cannot exceed the Moore bound, of the form M(d, k) = d(k) - O(d(k-1)) for d - infinity and any fixed k. Known results in finite geometries on generalised (k + 1)-gons imply, for k = 2, 3, 5, existence of an infinite sequence of values of d such that n(d, k) = d(k) - O(d(k)). Thus, for k = 2, 3, 5 the Moore bound can be asymptotically approached in the sense that lim sup(d -infinity) n(d, k) /M (d, k)=1; moreover, no such result is known for any other value of k = 2. The corresponding graphs are, however, far from vertex-transitive, and there appears to be no obvious way to extend them to vertex-transitive graphs giving the same type of asymptotic result.
机译:最大程度d和直径k的曲线图的最大阶N(d,k)不能超过摩尔结合的摩尔·π(d,k)= d(k)-o(d(k-1)) d - & 无限和任何固定的k。 已知导致通用(k + 1) - 贡献的有限几何形状意味着K = 2,3,5,存在无限序列的d,使得n(d,k)= d(k) - o( d(k))。 因此,对于k = 2,3,5,摩尔结合可以在LiM sup(d-&无限远离)n(d,k)/ m(d,k)= 1的意义上是渐近的接近; 此外,没有任何其他值K&GT的结果已知这样的结果。然而,相应的图形是远离顶点传递的,并且似乎没有明显的方式将它们扩展到具有相同的顶点传递图 渐近结果的类型。

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