Abstract
The Topological Radon Theorem states that, for every continuous function from the boundary of a (d+1)-dimensional simplex into ℝn, there exists a pair of disjoint faces in the domain whose images intersect in ℝn. The similarity between that result and the classical Borsuk–Ulam Theorem is unmistakable, but a proof that the Topological Radon Theorem follows from Borsuk–Ulam is not immediate. In this note we provide an elementary argument verifying that implication.
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Guilbault, C.R. An Elementary Deduction of the Topological Radon Theorem from Borsuk–Ulam. Discrete Comput Geom 43, 951–954 (2010). https://doi.org/10.1007/s00454-009-9153-7
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DOI: https://doi.org/10.1007/s00454-009-9153-7