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arXiv 1005.4041math.DGmath.MG
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关于球面、曲面及其它齐性空间的大小

On the magnitude of spheres, surfaces and other homogeneous spaces

Simon Willerton

摘要:

在本文中,我们定义的幅度度量空间使用措施,而不是有限的子集,因为已经做了以前,并表明,这与早期的工作与伦斯特在arXiv:0908.1582。给出了具有内禀度规的n-球面的一个显式模。对任意齐次黎曼流形,计算了其幅值的渐近展开的首项,并将其表示为流形的体积和总数量曲率.在齐次曲面的特殊情况下,渐近的形式可以精确地给出直到消失项,这只涉及面积和欧拉示性数,其方法与以前的工作中对欧几里得空间的子集所做的方法相同。

英文摘要:

In this paper we define the magnitude of metric spaces using measures rather than finite subsets as had been done previously and show that this agrees with earlier work with Leinster in arXiv:0908.1582. An explicit formula for the magnitude of an n-sphere with its intrinsic metric is given. For an arbitrary homogeneous Riemannian manifold the leading terms of the asymptotic expansion of the magnitude are calculated and expressed in terms of the volume and total scalar curvature of the manifold. In the particular case of a homogeneous surface the form of the asymptotics can be given exactly up to vanishing terms and this involves just the area and Euler characteristic in the way conjectured for subsets of Euclidean space in previous work.

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