Geometry and topology of random 2-complexes
Geometry and topology of random 2-complexes
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随机 2-复合体的几何和拓扑
DOI:
10.1007/s11856-015-1240-2
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发表时间:
2015
影响因子:
1
通讯作者:
Costa A
中科院分区:
文献类型:
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作者:
Costa A
We study random 2-dimensional complexes in the Linial-Meshulam model and prove that the fundamental group of a random 2-complexYhas cohomological dimension ≤ 2 if the probability parameter satisfiesp≪n−3/5. Besides, forthe fundamental groupπ1(Y) has elements of order two and is of infinite cohomological dimension. We also prove that forthe fundamental group of a random 2-complex has nom-torsion, for any given odd primem≥ 3. We find a simple algorithmically testable criterion for a subcomplex of a random 2-complex to be aspherical; this implies that (for) any aspherical subcomplex of a random 2-complex satisfies the Whitehead conjecture. We use inequalities for Cheeger constants and systoles of simplicial surfaces to analyse spheres and projective planes lying in random 2-complexes. Our proofs exploit the uniform hyperbolicity property of random 2-complexes (Theorem 3.4).
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DOI:
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发表时间:
2006
期刊:
影响因子:
--
作者:
M. Katz;Yuli B. Rudyak;S. Sabourau
通讯作者:
S. Sabourau
DOI:
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发表时间:
1981
期刊:
影响因子:
--
作者:
M. Ronan
通讯作者:
M. Ronan
DOI:
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发表时间:
2006
期刊:
Comb.
影响因子:
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作者:
N. Linial;R. Meshulam
通讯作者:
R. Meshulam
影响因子:
0.8
作者:
Cohen D
通讯作者:
Cohen D
影响因子:
1.8
作者:
W. Cockcroft
通讯作者:
W. Cockcroft