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The Erdos-Posa property for edge-disjoint immersions in 4-edge-connected graphs

机译:ERDOS-POSA属性用于4边连接图中的边缘不相交的沉浸区

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A graph H is immersed in a graph G if the vertices of H are mapped to distinct vertices of G, and the edges of H are mapped to paths joining the corresponding pairs of vertices of G, in such a way that the paths are pairwise edge-disjoint. In this paper, we show that the Erdos-Posa property holds for packing edge-disjoint Kt-immersions in 4-edge-connected graphs. More precisely, for positive integers k and t, there exists a constant f(k,t) such that a 4-edge-connected graph G has either k edge-disjoint K-t-immersions, or an edge subset F of size at most f(k,t) such that G-F has no K-t-immersion. The 4-edge-connectivity in this statement is best possible in the sense that 3-edge-connected graphs do not have the Erdos-Posa property. (C) 2018 Elsevier Inc. All rights reserved
机译:如果将H的顶点映射到G的不同顶点,则将图H浸没在图G中,并且H的边缘被映射到加入G的相应顶点的路径,以便路径是成对边缘的方式 -disjoint。 在本文中,我们表明ERDOS-POSA属性适用于在4边连接的图形中包装边缘不相交的KT沉浸位。 更确切地说,对于正整数K和T,存在恒定的f(k,t),使得4边缘连接的图形g具有k边缘脱节kt-沉浸,或大多数的尺寸的边缘子集f (k,t)使得GF没有KT浸渍。 在此语句中的4边缘连接是最佳的,在某种意义上,3边连接的图形没有ERDOS-POSA属性。 (c)2018 Elsevier Inc.保留所有权利

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