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arXiv 1407.0752math.GTmath.CO
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4-流形的简单结晶

Simple crystallizations of 4-manifolds

Biplab Basak, Jonathan Spreer

摘要:

单连通PL 4-流形的极小结晶是非常自然的对象。它们的许多拓扑特征反映在它们的组合结构中,此外,在连接和运算下保持不变。我们提出了一个最小的结晶标准PL K3表面。结合已知的结果,这产生了最小的结晶化的所有单连通PL 4-流形的"标准"型,即所有连接和$\mathbb{CP}^2$,$S^2 \times S^2$,和K3表面。特别地,我们得到了一对同胚但非PL-同胚的4-流形的极小结晶。此外,我们还初等地证明了$\mathbb{CP}^2$的最小8-顶点结晶是唯一的,并且它的伪三角剖分与$\mathbb{CP}^2$的9-顶点组合三角剖分通过四边收缩的最小值相联系.

英文摘要:

Minimal crystallizations of simply connected PL 4-manifolds are very natural objects. Many of their topological features are reflected in their combinatorial structure which, in addition, is preserved under the connected sum operation. We present a minimal crystallization of the standard PL K3 surface. In combination with known results this yields minimal crystallizations of all simply connected PL 4-manifolds of "standard" type, that is, all connected sums of $\mathbb{CP}^2$, $S^2 \times S^2$, and the K3 surface. In particular, we obtain minimal crystallizations of a pair of homeomorphic but non-PL-homeomorphic 4-manifolds. In addition, we give an elementary proof that the minimal 8-vertex crystallization of $\mathbb{CP}^2$ is unique and its associated pseudotriangulation is related to the 9-vertex combinatorial triangulation of $\mathbb{CP}^2$ by the minimum of four edge contractions.

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