Colorful Borsuk–Ulam theorems and applications: F. Frick and Z. Wellner
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 …
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 …
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.
Springer