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arXiv 1707.01422math.AP
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非齐次Kolmogorov型李群的内蕴泰勒公式

Intrinsic Taylor formula for non-homogeneous Kolmogorov-type Lie groups

Stefano Pagliarani, Michele Pignotti

摘要:

本文证明了一类在研究亚椭圆型微分算子即Kolmogorov算子时产生的李群的一个内禀泰勒公式。余项的估计是根据这些算子所诱导的内禀范数。这些结果推广了Pascucci和本文作者最近的一个工作,其中在附加假设李群在Folland & Stein意义下是齐次的条件下,给出了内蕴Hölder空间及其Taylor多项式的完整刻画.值得注意的是,内禀泰勒多项式与齐次多项式具有相同的表示形式。

英文摘要:

We prove an intrinsic Taylor-like formula for a class of Lie groups arising in the study of some sub-elliptic differential operators, namely the Kolmogorov operators. The estimate of the remainder is in terms of the intrinsic norm induced by such operators. These results extend the recent developments in a work by Pascucci and the present authors, where a full characterization of the intrinsic Hölder spaces and their Taylor polynomials were given under the additional assumption that the Lie group is homogeneous in the sense of Folland & Stein. Remarkably, the intrinsic Taylor polynomial admits the same representation as in the homogeneous case.

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