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Joints of Varieties
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39_2022_Article_597.pdf
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571.61 KB
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Adobe PDF
Checksum (MD5)
5d661ff22b94501dbce51eabf823fe2a
Author(s)
Tidor, Jonathan
Yu, Hung-Hsun H.
Zhao, Yufei
Date Issued
April 9, 2022
Publisher
Springer International Publishing
Citation
Tidor, Jonathan, Yu, Hung-Hsun H. and Zhao, Yufei. 2022. "Joints of Varieties."
Version
Final published version
Abstract
Abstract
We generalize the Guth–Katz joints theorem from lines to varieties. A special case says that N planes (2-flats) in 6 dimensions (over any field) have
$$O(N^{3/2})$$
O
(
N
3
/
2
)
joints, where a joint is a point contained in a triple of these planes not all lying in some hyperplane. More generally, we prove the same bound when the set of N planes is replaced by a set of 2-dimensional algebraic varieties of total degree N, and a joint is a point that is regular for three varieties whose tangent planes at that point are not all contained in some hyperplane. Our most general result gives upper bounds, tight up to constant factors, for joints with multiplicities for several sets of varieties of arbitrary dimensions (known as Carbery’s conjecture). Our main innovation is a new way to extend the polynomial method to higher dimensional objects, relating the degree of a polynomial and its orders of vanishing on a given set of points on a variety.
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1007/s00039-022-00597-5
