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Betti numbers of cut ideals of trees

Cut ideals, introduced by Sturmfels and Sullivant, are used in phylogenetics and algebraic statistics. We study the minimal free resolutions of cut ideals of tree graphs. By employing basic methods from topological combinatorics, we obtain upper bounds for the Betti numbers of this type of ideals. These take the form of simple formulas on the number of vertices, which arise from the enumeration of induced subgraphs of certain incomparability graphs associated to the edge sets of trees.

preprint2013arXivOpen access
Samu PotkaCamilo Sarmiento
math.COmath.AC
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Samu PotkaCamilo Sarmiento

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