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首页> 外文期刊>SIAM Journal on Discrete Mathematics >COMBINED DEGREE AND CONNECTIVITY CONDITIONS FOR H-LINKED GRAPHS
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COMBINED DEGREE AND CONNECTIVITY CONDITIONS FOR H-LINKED GRAPHS

机译:H联结图的组合度和连通性条件

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摘要

For a given multigraph H, a graph G is H-linked if vertical bar G vertical bar >= vertical bar H vertical bar and for every injective map tau : V (H) -> V (G), we can find internally disjoint paths in G, such that every edge from uv in H corresponds to a tau(u) - tau(v) path. To guarantee that a G is H-linked, you need a minimum degree larger than vertical bar G vertical bar/2. This situation changes, if you know that G has a certain connectivity k. Depending on k, even a minimum degree independent of vertical bar G vertical bar may suffice. Let delta(k, H, N) be the minimum number such that every k-connected graph G with vertical bar G vertical bar = N and delta(G) >= delta(k, H, N) is H-linked. We study bounds for this quantity. In particular, we find bounds for all multigraphs H with at most three edges and some with four edges, which are optimal up to small additive or multiplicative constants. As a consequence, we also establish a few pure connectivity bounds for graph linkages.
机译:对于给定的多重图H,如果垂直条G垂直条> =垂直条H垂直条并且对于每个内射图tau:V(H)-> V(G),则图G是H链接的,我们可以找到内部不相交的路径在G中,使得uv中H中的每个边都对应于tau(u)-tau(v)路径。为了确保G是H链接的,您需要的最小角度大于垂直条G vertical bar / 2。如果您知道G具有特定的连通性k,这种情况就会改变。取决于k,即使是与竖线G,竖线无关的最小度也可以满足。设delta(k,H,N)为最小值,以使每个带有k的图G的竖线G竖线= N且delta(G)> = delta(k,H,N)被H链接。我们研究此数量的界限。特别是,我们找到了所有多图H的边界,这些边界最多具有三个边缘,有些具有四个边缘,这对于较小的加法或乘法常数都是最佳的。因此,我们还为图链接建立了一些纯连通性边界。

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