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arXiv 1701.06249q-bio.PEmath.CO
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每棵大树的背后都有一个巨大的(系统发育)网络

Behind Every Great Tree is a Great (Phylogenetic) Network

Michael Hendriksen

摘要:

在Francis和Steel(2015)中,证明了在$4$叶子上存在非平凡网络,在这些叶子上距离度量提供了一个不是网络基树的树上的度量。在本文中,我们在两个方向上推广这个结果。我们发现,对于任何树$T$存在一个家庭的非平凡的HGT网络$N$的距离度量$d_N$提供了一个度量$T$。我们还提供了一类网络上的任何数量的叶子上的距离度量提供了一个度量的树,这不是网络的基树。这类网络都是“浮动”网络,是本文所介绍的一类新网络的子类,被称为“通用”网络。然后描述了多功能网络的特征。此外,我们发现了一个下界的“有用的”HGT弧在这样的网络中,在某种意义上解释的文件。这个下界等于主要结果中每个浮动网络所需的HGT弧的数量,因此我们的网络在这个意义上是最小的。

英文摘要:

In Francis and Steel (2015), it was shown that there exists non-trivial networks on $4$ leaves upon which the distance metric affords a metric on a tree which is not the base tree of the network. In this paper we extend this result in two directions. We show that for any tree $T$ there exists a family of non-trivial HGT networks $N$ for which the distance metric $d_N$ affords a metric on $T$. We additionally provide a class of networks on any number of leaves upon which the distance metric affords a metric on a tree which is not the base tree of the network. The family of networks are all "floating" networks, a subclass of a novel family of networks introduced in this paper, and referred to as "versatile" networks. Versatile networks are then characterised. Additionally, we find a lower bound for the number of `useful' HGT arcs in such networks, in a sense explained in the paper. This lower bound is equal to the number of HGT arcs required for each floating network in the main results, and thus our networks are minimal in this sense.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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