English

No-dimensional Helly's theorem in uniformly convex Banach spaces

Functional Analysis 2024-09-10 v1

Abstract

We study the ``no-dimensional'' analogue of Helly's theorem in Banach spaces. Specifically, we obtain the following no-dimensional Helly-type results for uniformly convex Banach spaces: Helly's theorem, fractional Helly's theorem, colorful Helly's theorem, and colorful fractional Helly's theorem. The combinatorial part of the proofs for these Helly-type results is identical to the Euclidean case as presented in \cite{adiprasito2020theorems}. The primary difference lies in the use of a certain geometric inequality in place of the Pythagorean theorem. This inequality can be explicitly expressed in terms of the modulus of convexity of a Banach space.

Keywords

Cite

@article{arxiv.2409.05744,
  title  = {No-dimensional Helly's theorem in uniformly convex Banach spaces},
  author = {G. Ivanov},
  journal= {arXiv preprint arXiv:2409.05744},
  year   = {2024}
}
R2 v1 2026-06-28T18:38:43.193Z