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Goldberg's conjecture is true for random multigraphs

机译:Goldberg的猜想对于随机多层来说是如此

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In the 70s, Goldberg, and independently Seymour, conjectured that for any multigraph G, the chromatic index x'(G) satisfies X'(G) <= max{Delta(G) [rho(G)]}, where rho(G) = max{e(G[S]/right perpendicular vertical bar S vertical bar/2left perpendicular vertical bar S subset of V}. We show that their conjecture (in a stronger form) is true for random multigraphs. Let M(n, m) be the probability space consisting of all loopless multigraphs with n vertices and m edges, in which in pairs from [n] are chosen independently at random with repetitions. Our result states that, for a given m := m(n), M similar to M(n, m) typically satisfies chi'(G) = max{Delta(G), inverted right perpendicular rho(G)inverted left perpendicular}. In particular, we show that if n is even and in := m(n), then chi'(M) = Delta(M) for a typical M similar to M(n,m). Furthermore, for a fixed epsilon > 0, if n is odd, then a typical M similar to M(n,m) has x/(M) = Delta(M) for m <= (1 - epsilon)n(3) log n, and chi'(M) = inverted right perpendicular rho(G)inverted left perpendicular for m >= (1 + epsilon)n(3) log n. To prove this result, we develop a new structural characterization of multigraphs with chromatic index larger than the maximum degree. (C) 2019 Elsevier Inc. All rights reserved.
机译:在70年代,戈德伯格和独立的Seymour中,介于任何多角形G,色度指数x'(g)满足X'(g)<= max {delta(g)[rho(g)]},其中rho( g)= max {e(g n,m)是由n个顶点和m边缘的所有无循环多层物组成的概率空间,其中从[n]成对地选择随机选择,随机选择。我们的结果表明,对于给定的m:= m:= m(n ),与M(n,m)类似的m通常满足Chi'(g)= max {delta(g),反转右垂直rho(g)倒置左侧垂直}。特别是,如果n是偶数并且在:= m(n),然后chi'(m)= delta(m)类似于m(n,m)的典型m。此外,对于固定的epsilon> 0,如果n是奇数,则典型的m类似对于m(n,m)具有x /(m)= delta(m)对于m <=(1 - epsilon)n(3)log n,和chi'(m)=导航rted右垂直rho(g)垂直于m> =(1 + epsilon)n(3)log n。为了证明这一结果,我们开发了具有大于最大程度的色彩指数的多层物的新结构表征。 (c)2019 Elsevier Inc.保留所有权利。

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