σ-space is a contractible CAT(0) cubical complex of nested ranked tree topologies with inter-event times that admits unique geodesics and well-defined Fréchet means.
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Nested tree space: a geometric framework for co-phylogeny
σ-space is a contractible CAT(0) cubical complex of nested ranked tree topologies with inter-event times that admits unique geodesics and well-defined Fréchet means.