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arXiv 1306.2616math.GTmath.CO
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Haken四维流形的欧拉示性数

The Euler Characteristic of a Haken 4-Manifold

Allan L. Edmonds

摘要:

Haken n-流形是由B. Foozwell和H. Rubinstein提出的方法,该方法可以沿着本质余维1子流形连续切开,直到得到n-胞腔的不相交并。这样的流形配备了一个边界模式,一种特殊类型的边界分解为余维零子流形。证明了存在一个仅依赖于紧致Haken 4-流形X^4的边界和边界模式的数值函数phi(X^4)(如果X^4有空边界,则为零),使得对任意紧致Haken 4-流形X^4,欧拉示性数满足不等式chi(X^4)>= phi(X^4).特别地,如果X^{4}是闭哈肯4-流形,则chi(X^4)>= 0。

英文摘要:

Haken n-manifolds are aspherical manifolds, defined and studied by B. Foozwell and H. Rubinstein, that can be successively cut open along essential codimension-one submanifolds until a disjoint union of n-cells is obtained. Such manifolds come equipped with a boundary pattern, a particular kind of decomposition of the boundary into codimension-zero submanifolds. We prove that there is a certain numerical function phi(X^4) depending only on the boundary and boundary pattern of the compact Haken 4-manifold X^4 (and vanishing if X^4 has empty boundary), such that for any compact Haken 4-manifold X^4 the Euler characteristic satisfies the inequality chi(X^4) >= phi(X^4). In particular, if X^{4} is a closed Haken 4-manifold, then chi(X^4) >= 0.

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