Abstract
In their paper “Some application, properties and conjectures for higher order cumulants of a Markovian stepping-stone model”, Zheng and Matis make use of a conjecture known as “Phenomenon B” regarding the eigenvalues of a tridiagonal matrix having a certain form. While the conjecture was shown to hold for particular cases, it was not proven in general. To supplement the Zheng and Matis paper, a formal proof of Phenomenon B is given here.
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