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On problems about judicious bipartitions of graphs

机译:论图表的明智双排问题

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Bollobas and Scott [5] conjectured that every graph G has a balanced bipartite spanning subgraph H such that for each v is an element of V (G), d(H) (v) >= (d(G)(v) - 1)/2. In this paper, we show that every graphic sequence has a realization for which this Bollobas-Scott conjecture holds, confirming a conjecture of Hartke and Seacrest [8]. On the other hand, we give an infinite family of counterexamples to this Bollobas-Scott conjecture, which indicates that ((d(G)(v) - 1)/2] (rather than (d(G)(v) - 1)/2) is probably the correct lower bound. We also study bipartitions V-1, V-2 of graphs with a fixed number of edges. We provide a (best possible) upper bound on e(V-1)(lambda) + e(V-2)(lambda) for any real lambda >= 1 (the case A = 2 is a question of Scott 12]) and answer a question of Scott (Problem 3.9 in [12]) on max{e(V-1), e(V-2)}. (C) 2019 Elsevier Inc. All rights reserved.
机译:Bollobas和Scott [5]介绍每个图G具有平衡二角形的跨越子图H,使得对于每个V的是V(g),d(h)(v)> =(d(g)(v)的元素 - 1)/ 2。 在本文中,我们表明每个图形序列都有一个这个Bollobas-Scott猜想所在的实现,确认HARTKE和SEACRETT的猜想[8]。 另一方面,我们向该Bollobas-Scott猜想中提供无限家庭的反应物,表明((d(g)(v) - 1)/ 2](而不是(d(g)(v) - 1 )/ 2)可能是正确的下限。我们还研究了具有固定数量的边缘的图形V-1,V-2的图形。我们提供了(V-1)(Lambda)的(最佳)上限 任何真实λ的+ e(v-2)(lambda)> = 1(案例a = 2是scott 12的问题),并回答Max {e( V-1),E(V-2)}。(c)2019年Elsevier Inc.保留所有权利。

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