Zobrazeno 1 - 10
of 125
pro vyhledávání: '"Lund, Ben"'
Generalizing a theorem of the first two authors and Geelen for planes, we show that, for a real-representable matroid $M$, either the average hyperplane-size in $M$ is at most a constant depending only on its rank, or each hyperplane of $M$ contains
Externí odkaz:
http://arxiv.org/abs/2410.05513
We prove that for a finite set of points $X$ in the projective $n$-space over any field, the Betti number $\beta_{n,n+1}$ of the coordinate ring of $X$ is non-zero if and only if $X$ lies on the union of two planes whose sum of dimension is less than
Externí odkaz:
http://arxiv.org/abs/2408.14064
We give an upper bound on the number of exceptional orthogonal projections of a small set of points in a plane over a prime order field, which makes progress toward a conjecture of Chen (2018). This theorem relies on a new upper bound on the number o
Externí odkaz:
http://arxiv.org/abs/2311.05148
A conjecture on radial projections in $\mathbb{F}_q^d$ states that if $E\subset \mathbb{F}_q^n$ with $q^{k-1}< |E|\leq q^{k}$ for some $k \in \{1,\dots, n-1\}$, then \[ \#\{y\in \mathbb{F}_q^n \mid |\pi^y(E)| < |E| \} \leq q^k. \] The case $k=n-1$ wa
Externí odkaz:
http://arxiv.org/abs/2311.05127
We give a construction of a convex set $A \subset \mathbb R$ with cardinality $n$ such that $A-A$ contains a convex subset with cardinality $\Omega (n^2)$. We also consider the following variant of this problem: given a convex set $A$, what is the si
Externí odkaz:
http://arxiv.org/abs/2309.07527
Autor:
Chakraborti, Debsoumya, Lund, Ben
For $d\ge 2$ and an odd prime power $q$, consider the vector space $\mathbb{F}_q^d$ over the finite field $\mathbb{F}_q$, where the distance between two points $(x_1,\ldots,x_d)$ and $(y_1,\ldots,y_d)$ is defined as $\sum_{i=1}^d (x_i-y_i)^2$. A dist
Externí odkaz:
http://arxiv.org/abs/2306.12023
We call an edge-colored graph rainbow if all of its edges receive distinct colors. An edge-colored graph $\Gamma$ is called $H$-rainbow saturated if $\Gamma$ does not contain a rainbow copy of $H$ and adding an edge of any color to $\Gamma$ creates a
Externí odkaz:
http://arxiv.org/abs/2212.04640
Motivated by recent results on radial projections and applications to the celebrated Falconer distance problem, we study radial projections in the setting of finite fields. More precisely, we extend results due to Mattila and Orponen (2016), Orponen
Externí odkaz:
http://arxiv.org/abs/2205.07431
The main purpose of this paper is to provide threshold functions for the events that a random subset of the points of a finite vector space has certain properties related to point-flat incidences. Specifically, we consider the events that there is an
Externí odkaz:
http://arxiv.org/abs/2203.12801
Autor:
Balogh, József, Chen, Ce, Hendrey, Kevin, Lund, Ben, Luo, Haoran, Tompkins, Casey, Tran, Tuan
A family $\mathcal{F}$ on ground set $[n]:=\{1,2,\ldots, n\}$ is maximal $k$-wise intersecting if every collection of at most $k$ sets in $\mathcal{F}$ has non-empty intersection, and no other set can be added to $\mathcal{F}$ while maintaining this
Externí odkaz:
http://arxiv.org/abs/2110.12708