BALLS AND METRICS DEFINED BY VECTOR-FIELDS .1. BASIC PROPERTIES
BALLS AND METRICS DEFINED BY VECTOR-FIELDS .1. BASIC PROPERTIES
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DOI：
10.1007/bf02392539
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发表时间：
1985-01-01
期刊：
影响因子：
3.7
通讯作者：
WAINGER, S
中科院分区：
文献类型：
--
作者：
NAGEL, A;STEIN, EM;WAINGER, S
在本文中，我们研究了某些球和度量的基本属性，这些属性可以根据给定的向量场族自然地定义。作为一个应用，我们然后使用这些属性来获得一些非椭圆偏微分算子的近似逆的核的估计，例如 HOmander 的平方和。一些
In this paper we study the basic properties of certain balls and metrics that can be naturally defined in terms of a given family of vector fields. As an application, we then use these properties to obtain estimates for the kernels of approximate inverses of some non-elliptic partial differential operators, such as HOrmander's sum of squares. Some