12 citations · 66 across the 25 of their papers we have counts for
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q-bio.PE2026
Specieslike clusters based on identical ancestor points
Samuel Allen Alexander
We introduce several axioms which may or may not hold for any given subgraph of the directed graph of all organisms (past, present and future) where edges represent biological pare…
q-bio.PE2012★ 11 cited
Infinite graphs in systematic biology, with an application to the species problem
Samuel Alexander
We argue that C. Darwin and more recently W. Hennig worked at times under the simplifying assumption of an eternal biosphere. So motivated, we explicitly consider the consequences…