تقرير
The B\'ar\'any-Kalai conjecture for certain families of polytopes
| العنوان: | The B\'ar\'any-Kalai conjecture for certain families of polytopes |
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| المؤلفون: | Soberón, Pablo, Zerbib, Shira |
| سنة النشر: | 2024 |
| المجموعة: | Mathematics |
| مصطلحات موضوعية: | Mathematics - Combinatorics, 52A37, 55M20 |
| الوصف: | B\'ar\'any and Kalai conjectured the following generalization of Tverberg's theorem: if $f$ is a linear function from an $m$-dimensional polytope $P$ to $\mathbb{R}^d$ and $m \ge (d + 1)(r - 1)$, then there are $r$ pairwise disjoint faces of $P$ whose images have a point in common. We show that the conjecture holds for cross polytopes, cyclic polytopes, and more generally for $(d+1)$-neighborly polytopes. Moreover, we show that for cross polytopes, the conjecture holds if the map $f$ is assumed to be continuous (but not necessarily linear), and we give a lower bound on the number of sets of $r$ pairwise disjoint faces whose images under $f$ intersect. We also show that the conjecture holds for all polytopes when $d=1$ and $f$ is assumed to be continuous. Finally, when $r$ is prime or large enough with respect to $d$, we prove that there exists a constant $c=c(d,r)$, depending only on $d$ and $r$, such that the conjecture holds (with continuous functions) for the polytope obtained by taking $c$ subdivisions of $P$. Comment: 10 pages |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2404.11533 |
| رقم الأكسشن: | edsarx.2404.11533 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |