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

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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 N′N' of level at most that of NN such that

dN′=dNd_{N'}=d_N

and TT is the tree of blobs of N′N'. 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.

References

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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