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arXiv 1912.09360cs.DScs.CG
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最小生成树中的强制边

Imposing edges in Minimum Spanning Tree

Nicolas Isoart, Jean-Charles Régin

摘要:

我们感兴趣的后果强加边$T$的最小生成树。我们证明了在$T$的强制边缘的替换成本的总和是一个下界的额外费用。更确切地说,如果r-成本$(T,e)$是边缘$e$的替换成本,我们证明,如果我们施加一组$I$的非树边缘的$T$然后$\sum_{e \in I} $ r-成本$(T,e) \leq$成本$(T_{e \in I})$,其中$I$是一组强加的边缘和$T_{e \in I}$最小生成树包含所有的边缘$I$。

英文摘要:

We are interested in the consequences of imposing edges in $T$ a minimum spanning tree. We prove that the sum of the replacement costs in $T$ of the imposed edges is a lower bounds of the additional costs. More precisely if r-cost$(T,e)$ is the replacement cost of the edge $e$, we prove that if we impose a set $I$ of nontree edges of $T$ then $\sum_{e \in I} $ r-cost$(T,e) \leq$ cost$(T_{e \in I})$, where $I$ is the set of imposed edges and $T_{e \in I}$ a minimum spanning tree containing all the edges of $I$.

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