Distance split tree as the tree of blobs of an equivalent network

Let NN be a metric semidirected network on taxon set XX, let dNd_N denote its average distances on XX, and let TT be the distance split tree reconstructed from dNd_N. Distance-split-tree conjecture. There exists a semidirected network NN' of level at most that of NN such that

dN=dNd_{N'}=d_N

and TT is the tree of blobs of NN'. This would show that the distance split tree always represents the tree-of-blobs structure of a network with the same average distances and no greater level. The conjecture is motivated by examples and results for non-binary level-1 networks, but the source provides no resolution of the general claim.

Sources & referencesView supporting material

Primary source

Jingcheng Xu and Cécile Ané, “Identifiability of local and global features of phylogenetic networks from average distances”, arXiv:2110.11814 (2022).

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