Y-equivalence and rhombic realization of projective-planar quadrangulations
Y-equivalence and rhombic realization of projective-planar quadrangulations
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射影平面四边形的 Y 等价和菱形实现
DOI:
10.1016/j.dam.2021.04.026
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
A. Nakamoto and Y. Omizo
中科院分区:
文献类型:
--
作者:
Ryoya Kurita;Taira Shimizu;and Toshio Suzuki;A. Nakamoto and Y. Omizo
Let G be a quadrangulation on the projective plane P, ie, a map of a simple graph on P such that each face is quadrilateral. For a vertex v∈ V (G) of degree 3 with neighbors v 1, v 3, v 5, a Y-rotation is to delete three edges v v 1, v v 3, v v 5 and add v v 2, v v 4, v v 6, where the union of three faces incident to v is surrounded by a closed walk v 1 v 2 v 3 v 4 v 5 v 6. We say that G is k-minimal if its shortest noncontractible cycle is of length k and if any face contraction yields a noncontractible cycle of length less than k. It was proved that for any k≥ 3, any two k-minimal quadrangulations on P are Y-equivalent, ie, can be transformed into each other by Y-rotations (Nakamoto and Suzuki, 2012). In this paper, we find wider Y-equivalence classes of quadrangulations on P, extending a result on a geometric realization of quadrangulations on P as a rhombus tiling in an even-sided regular polygon (Hamanaka et al., 2020).
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