Year: 2025
Type: article
Abstract: We prove a colorful generalization of the Borsuk–Ulam theorem and derive colorful consequences from it, such as a colorful generalization of the ham sandwich theorem. Even in the uncolored case this specializes to a strengthening of the ham sandwich theorem, which given an additional condition, contains a result of Bárány, Hubard, and Jerónimo on well-separated measures as a special case. We prove a colorful generalization of Fan’s antipodal sphere covering theorem, we derive a short proof of Gale’s colorful KKM theorem, and we prove a colorful generalization of Brouwer’s fixed point theorem. Our results also provide an alternative between Radon-type intersection results and KKM-type covering results. Finally, we prove colorful Borsuk–Ulam theorems for higher symmetry.
Authors: Florian Frick, Zoe Wellner
Institutions: Carnegie Mellon University, Arizona State University
Language: English
Subfield: Discrete Mathematics and Combinatorics
Field: Mathematics
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,090
Funder: National Science Foundation
OpenAlex ID: W4413596247