The contraction category of graphs
The contraction category of graphs
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DOI:
10.1090/ert/616
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Ramos, Eric
中科院分区:
文献类型:
--
作者:
Proudfoot, Nicholas;Ramos, Eric
We study the category whose objects are graphs of fixed genus and whose morphisms are contractions. We show that the corresponding contravariant module categories are Noetherian and we study two families of modules over these categories. The first takes a graph to a graded piece of the homology of its unordered configuration space and the second takes a graph to an intersection homology group whose dimension is given by a Kazhdan–Lusztig coefficient; in both cases we prove that the module is finitely generated. This allows us to draw conclusions about torsion in the homology groups of graph configuration spaces, and about the growth of Betti numbers of graph configuration spaces and Kazhdan–Lusztig coefficients of graphical matroids. We also explore the relationship between our category and outer space, which is used in the study of outer automorphisms of free groups. References
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DOI:
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发表时间:
2006
期刊:
影响因子:
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作者:
K. Vogtmann
通讯作者:
K. Vogtmann
DOI:
10.1007/s00029-019-0520-9
发表时间:
2019
期刊:
Selecta Mathematica
影响因子:
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作者:
Ramos, Eric;White, Graham
通讯作者:
White, Graham
DOI:
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发表时间:
2017
期刊:
影响因子:
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作者:
N. Proudfoot;Benjamin Young
通讯作者:
Benjamin Young
DOI:
--
发表时间:
2018
期刊:
影响因子:
--
作者:
Eric Ramos
通讯作者:
Eric Ramos
DOI:
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发表时间:
2002
期刊:
影响因子:
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作者:
K. Vogtmann
通讯作者:
K. Vogtmann