The Two-Eyes Lemma: A Linking Problem for Table-Top Necklaces
The Two-Eyes Lemma: A Linking Problem for Table-Top Necklaces
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两只眼引理:桌面项链的链接问题
DOI:
10.1007/s00373-021-02439-x
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发表时间:
2022
影响因子:
0.7
通讯作者:
Yarmola, Andrew
中科院分区:
文献类型:
--
作者:
Gabai, David;Meyerhoff, Robert;Yarmola, Andrew
In this note, we answer a combinatorial question that is inspired by cusp geometry of hyperbolic 3-manifolds. A table-top necklace is a collection of sequentially tangent beads (i.e. spheres) with disjoint interiors lying on a flat table (i.e. a plane) such that each bead is of diameter at most one and is tangent to the table. We analyze the possible configurations of a necklace with at most 8 beads linking around two other spheres whose diameter is exactly 1. We show that all the beads are forced to have diameter one, the two linked spheres are tangent, and that each bead must be tangent to at least one of the two linked spheres. In fact, there is a 1-parameter family of distinct configurations.
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DOI:
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期刊:
European journal of combinatorics (Print)
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2020
期刊:
European journal of combinatorics (Print)
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