Subdivisions, shellability, and collapsibility of products
Subdivisions, shellability, and collapsibility of products
复制标题
产品的细分、可剥壳性和可折叠性
DOI:
10.1007/s00493-016-3149-8
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发表时间:
2017
期刊:
影响因子:
1.1
通讯作者:
Bruno Benedetti
中科院分区:
文献类型:
--
作者:
Karim Adiprasito;Bruno Benedetti
We prove that the second derived subdivision of any rectilinear triangulation of any convex polytope is shellable. Also, we prove that the first derived subdivision of every rectilinear triangulation of any convex 3-dimensional polytope is shellable. This complements Mary Ellen Rudin's classical example of a non-shellable rectilinear triangulation of the tetrahedron. Our main tool is a new relative notion of shellability that characterizes the behavior of shellable complexes under gluing.As a corollary, we obtain a new characterization of the PL property in terms of shellability: A triangulation of a sphere or of a ball is PL if and only if it becomes shellable after sufficiently many derived subdivisions. This improves on PL approximation theorems by Whitehead, Zeeman and Glaser, and answers a question by Billera and Swartz.We also show that any contractible complex can be made collapsible by repeatedly taking products with an interval. This strengthens results by Dierker and Lickorish, and resolves a conjecture of Oliver. Finally, we give an example that this behavior extends to non-evasiveness, thereby answering a question of Welker.
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DOI:
10.1017/s0305004100041268
发表时间:
1970
影响因子:
0.8
作者:
L. Glaser
通讯作者:
L. Glaser
DOI:
10.1007/bf02941601
发表时间:
1987
期刊:
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg
影响因子:
--
作者:
U. Pachner
通讯作者:
U. Pachner
影响因子:
1.3
作者:
M. Rudin
通讯作者:
M. Rudin
影响因子:
0.5
作者:
H. Bruggesser;P. Mani
通讯作者:
P. Mani
DOI:
10.1016/j.ejc.2014.10.002
发表时间:
2015
期刊:
Eur. J. Comb.
影响因子:
--
作者:
Karim Adiprasito;Bruno Benedetti
通讯作者:
Bruno Benedetti