A Quantification of a Besicovitch Non-linear Projection Theorem via Multiscale Analysis
A Quantification of a Besicovitch Non-linear Projection Theorem via Multiscale Analysis
复制标题
通过多尺度分析量化贝西科维奇非线性投影定理
DOI:
10.1007/s12220-021-00793-z
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Taylor, Krystal
中科院分区:
文献类型:
--
作者:
Davey, Blair;Taylor, Krystal
The Besicovitch projection theorem states that if a subsetEof the plane has finite length in the sense of Hausdorff measure and is purely unrectifiable (so its intersection with any Lipschitz graph has zero length), then almost every orthogonal projection ofEto a line will have zero measure. In other words, the Favard length of a purely unrectifiable 1-set vanishes. In this article, we show that when linear projections are replaced by certain non-linear projections calledcurve projections, this result remains true. In fact, we go further and use multiscale analysis to prove a quantitative version of this Besicovitch non-linear projection theorem. Roughly speaking, we show that if a subset of the plane has finite length in the sense of Hausdorff and is nearly purely unrectifiable, then itsFavard curve lengthis very small. Our techniques build on those of Tao, who in (Proc Lond Math Soc 98:559–584, 2009) proves a quantification of the original Besicovitch projection theorem.
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