Q4-irreducible even triangulations of the projective plane

Q4-irreducible even triangulations of the projective plane
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Q4-射影平面的不可约偶三角剖分

DOI:
10.1016/j.disc.2021.112736
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发表时间:
2022
影响因子:
0.8
通讯作者:
Suzuki Yusuke
Suzuki Yusuke
中科院分区:
数学3区
文献类型:
--
作者:
Hasegawa Jun;Suzuki Yusuke

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我们使用称为 Q 4 约简的运算建立了射影平面偶数三角剖分的新生成定理。也就是说,射影平面的每个偶三角剖分都可以从 Q 4-不可约偶三角剖分之一获得,该三角剖分包含一个称为射影三角形冲天炉(或简称 PTC)的特殊子图作为其子嵌入,通过一系列 Q 4 展开。由结果表明,(P 4,Q 4)-不可约偶三角剖分的集合与射影平面上以及球面情况下的(P,Q)-不可约偶三角剖分的集合一致。然而,我们表明该属性通常不适用于其他封闭曲面。
We establish a new generating theorem of even triangulations of the projective plane using an operation called a Q 4-reduction. That is, every even triangulation of the projective plane can be obtained from one of the Q 4-irreducible even triangulations, which contains a special subgraph named a projective-triangular cupola (or simply PTC) as its subembedding, by a sequence of Q 4-expansions. By the result, we show that the set of (P 4, Q 4)-irreducible even triangulations coincides with that of (P, Q)-irreducible ones on the projective plane as well as the spherical case. However, we show that the property does not hold in general for the other closed surfaces.
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DOI: 10.1016/j.disc.2009.12.023
发表时间: 2010
期刊: Discret. Math.
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