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Circular planar electrical networks, Split systems, and Phylogenetic networks
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We study a new invariant of circular planar electrical networks, well known to phylogeneticists: the circular split system. We use our invariant to answer some open questions about levels of complexity of networks and their related Kalmanson metrics. The key to our analysis is the realization that certain matrices arising from weighted split systems are studied in another guise: the Kron reductions of Laplacian matrices of planar electrical networks. Specifically we show that a response matrix of a circular planar electrical network corresponds to a unique resistance metric obeying the Kalmanson condition, and thus a unique weighted circular split system. Our results allow interchange of methods: phylogenetic reconstruction using theorems about electrical networks, and circuit reconstruction using phylogenetic techniques.
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Electrical networks and data analysis in phylogenetics
A Kalmanson metric is an electrical resistance metric if and only if an explicitly constructed matrix lies in the totally nonnegative Isotropic Grassmannian with a nonvanishing Plücker coordinate.
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