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- W4295680061 abstract "Evolutionary relationships between species are represented by phylogenetic trees, but these relationships are subject to uncertainty due to the random nature of evolution. A geometry for the space of phylogenetic trees is necessary in order to properly quantify this uncertainty during the statistical analysis of collections of possible evolutionary trees inferred from biological data. Recently, the wald space has been introduced: a length space for trees which is a certain subset of the manifold of symmetric positive definite matrices. In this work, the wald space is introduced formally and its topology and structure is studied in detail. In particular, we show that wald space has the topology of a disjoint union of open cubes, it is contractible, and by careful characterization of cube boundaries, we demonstrate that wald space is a Whitney stratified space of type (A). Imposing the metric induced by the affine invariant metric on symmetric positive definite matrices, we prove that wald space is a geodesic Riemann stratified space. A new numerical method is proposed and investigated for construction of geodesics, computation of Fr'echet means and calculation of curvature in wald space. This work is intended to serve as a mathematical foundation for further geometric and statistical research on this space." @default.
- W4295680061 created "2022-09-14" @default.
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- W4295680061 date "2022-09-12" @default.
- W4295680061 modified "2023-10-14" @default.
- W4295680061 title "Foundations of the Wald Space for Phylogenetic Trees" @default.
- W4295680061 doi "https://doi.org/10.48550/arxiv.2209.05332" @default.
- W4295680061 hasPublicationYear "2022" @default.
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