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arXiv 0910.0799math.LOmath.AG
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p-adic可定义集的局部度量性质和正则分层

Local metric properties and regular stratifications of p-adic definable sets

R. Cluckers, G. Comte, F. Loeser

摘要:

本文从度量几何、微分几何和测度几何的角度研究了$p$-adic域上可定义(半代数或次解析)集芽的几何。我们证明了这样的集合在它们的每一个点上的局部密度确实存在。然后,我们引入了关于域的乘法群中某个有限指数开子群的特殊切锥的概念,并证明了,与实情形一样,在一定的重数下,局部密度可以在这个特殊切锥上计算,同时我们还证明了这些特殊切锥对于足够小的子群是稳定的.我们最终得到了密度的Cauchy-Crofton公式的$p$-adic对应。为了证明这些结果,我们使用arXiv:0904.3853v1的可定义$p$-进集的Lipschitz分解,并在这里证明分层的正则性条件的通用性,例如$(w_f)$、$(w)$、$(a_f)$、$(b)$和$(a)$条件。

英文摘要:

We study the geometry of germs of definable (semialgebraic or subanalytic) sets over a $p$-adic field from the metric, differential and measure geometric point of view. We prove that the local density of such sets at each of their points does exist. We then introduce the notion of distinguished tangent cone with respect to some open subgroup with finite index in the multiplicative group of our field and show, as it is the case in the real setting, that, up to some multiplicities, the local density may be computed on this distinguished tangent cone.We also prove that these distinguished tangent cones stabilize for small enough subgroups. We finally obtain the $p$-adic counterpart of the Cauchy-Crofton formula for the density. To prove these results we use the Lipschitz decomposition of definable $p$-adic sets of arXiv:0904.3853v1 and prove here the genericity of the regularity conditions for stratification such as $(w_f)$, $(w)$, $(a_f)$, $(b)$ and $(a)$ conditions.

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