Reciprocal Maximum Likelihood Degrees of Brownian Motion Tree Models

09/24/2020

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by   Tobias Boege, et al.

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We give an explicit formula for the reciprocal maximum likelihood degree of Brownian motion tree models. To achieve this, we connect them to certain toric (or log-linear) models, and express the Brownian motion tree model of an arbitrary tree as a toric fiber product of star tree models.