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• W3035552617 abstract "Edge connectivity of a graph is one of the most fundamental graph-theoretic concepts. The celebrated tree packing theorem of Tutte and Nash-Williams from 1961 states that every $k$-edge connected graph $G$ contains a collection $cal{T}$ of $lfloor k/2 rfloor$ edge-disjoint spanning trees, that we refer to as a tree packing; the diameter of the tree packing $cal{T}$ is the largest diameter of any tree in $cal{T}$. A desirable property of a tree packing, that is both sufficient and necessary for leveraging the high connectivity of a graph in distributed communication, is that its diameter is low. Yet, despite extensive research in this area, it is still unclear how to compute a tree packing, whose diameter is sublinear in $|V(G)|$, in a low-diameter graph $G$, or alternatively how to show that such a packing does not exist. In this paper we provide first non-trivial upper and lower bounds on the diameter of tree packing. First, we show that, for every $k$-edge connected $n$-vertex graph $G$ of diameter $D$, there is a tree packing $cal{T}$ of size $Omega(k)$, diameter $O((101klog n)^D)$, that causes edge-congestion at most $2$. Second, we show that for every $k$-edge connected $n$-vertex graph $G$ of diameter $D$, the diameter of $G[p]$ is $O(k^{D(D+1)/2})$ with high probability, where $G[p]$ is obtained by sampling each edge of $G$ independently with probability $p=Theta(log n/k)$. This provides a packing of $Omega(k/log n)$ edge-disjoint trees of diameter at most $O(k^{(D(D+1)/2)})$ each. We then prove that these two results are nearly tight. Lastly, we show that if every pair of vertices in a graph has $k$ edge-disjoint paths of length at most $D$ connecting them, then there is a tree packing of size $k$, diameter $O(Dlog n)$, causing edge-congestion $O(log n)$. We also provide several applications of low-diameter tree packing in distributed computation." @default.
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• W3035552617 date "2020-06-12" @default.
• W3035552617 modified "2023-09-27" @default.
• W3035552617 title "On Packing Low-Diameter Spanning Trees" @default.
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