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- W2885170404 abstract "Given a finite collection of $C^1$ vector fields on a $C^2$ manifold which span the tangent space at every point, we consider the question of when there is locally a coordinate system in which these vector fields are $mathscr{C}^{s+1}$ for $sin (1,infty]$, where $mathscr{C}^s$ denotes the Zygmund space of order $s$. We give necessary and sufficient, coordinate-free conditions for the existence of such a coordinate system. Moreover, we present a quantitative study of these coordinate charts. This is the second part in a three-part series of papers. The first part, joint with Stovall, addressed the same question, though the results were not sharp, and showed how such coordinate charts can be viewed as scaling maps in sub-Riemannian geometry. When viewed in this light, these results can be seen as strengthening and generalizing previous works on the quantitative theory of sub-Riemannian geometry, initiated by Nagel, Stein, and Wainger, and furthered by Tao and Wright, the author, and others. In the third part, we prove similar results concerning real analyticity." @default.
- W2885170404 created "2018-08-22" @default.
- W2885170404 creator A5077939778 @default.
- W2885170404 date "2018-08-13" @default.
- W2885170404 modified "2023-09-27" @default.
- W2885170404 title "Coordinates Adapted to Vector Fields II: Sharp Results" @default.
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