Convex Union Representability and Convex Codes
Convex Union Representability and Convex Codes
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DOI:
10.1093/imrn/rnz055
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发表时间:
2019
影响因子:
1
通讯作者:
Novik, Isabella
中科院分区:
文献类型:
--
作者:
Jeffs, R Amzi;Novik, Isabella
We introduce and investigate-convex union representable complexes: the simplicial complexes that arise as the nerve of a finite collection of convex open sets inwhose union is also convex. Chen, Frick, and Shiu recently proved that such complexes are collapsible and asked if all collapsible complexes are convex union representable. We disprove this by showing that there exist shellable and collapsible complexes that are not convex union representable; there also exist non-evasive complexes that are not convex union representable. In the process we establish several necessary conditions for a complex to be convex union representable such as that such a complexcollapses onto the star of any face of, that the Alexander dual ofmust also be collapsible, and that iffacets ofcontain all free faces of, thenis-representable. We also discuss some sufficient conditions for a complex to be convex union representable. The notion of convex union representability is intimately related to the study of convex neural codes. In particular, our results provide new families of examples of non-convex neural codes.
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