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26 April 2024 |
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On incidences of lines in regular complexes | Misha Rudnev
; | Date: |
10 Mar 2020 | Abstract: | A line complex is a three-parameter set of lines in space, whose Pl"ucker
vectors lie in a hyperplane. The main result is an incidence bound
$O(n^{1/2}m^{3/4} + m+nlog m)$ for the number of incidences between $n$ lines
in a regular complex and $m$ points in $mathbb F^3$, where $mathbb F$ is any
field, with $nleq char(mathbb F)$ in positive characteristic. Zahl has
recently discovered that bichromatic pair-wise incidences of lines coming from
two distinct line complexes describe the nonzero single distance problem for a
set of $n$ points in $mathbb F^3$ and proved a bound $O(n^{3/2})$ for the
number of realisations of the distance, which is a square, for $mathbb F$,
where $-1$ is not a square. Our main theorem entails, under suitable
constraints, a single distance bound $O(n^{1.6})$, which holds for any
distance, including zero over any $mathbb F$ and incidence bound for isotropic
lines in $mathbb F^3$. | Source: | arXiv, 2003.4744 | Services: | Forum | Review | PDF | Favorites |
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