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A Universal Chord Theorem for Triangulable Spaces

Kalev Martinson ⟨kalev@gatech.edu⟩

Abstract:

Where A is a topological space, let f:[0,1]A. Define the Horizontal Chord Set Df:=R|x[0,1],f(x)=f(x+). Let LA be the loop space of A. It has been previously proven that fLRDf=1n|nN0. It has also previously been proven that the Lebesgue measure λ(Df)12 for fLR. For a topological space A, denote the constant kA=infλ(Df):fLA.

In this paper we characterize kA for triangulable spaces, proving kA=1 when A is 0-dimensional, and kA=0 when A is more than 2-dimensional, or is 1-dimensional and has a cycle. When A is 1-dimensional and has no cycles it is a tree, we prove that kA1n where n is the number of leaves, and conjecture that kA=1n. We show that the map fλ(Df) is not continuous, making the proof of this conjecture difficult. We finally generalize Paul Levy’s Universal Chord Theorem by showing that for any tree A with a vertex of degree three or more, fLADf=0,1.

Scheduled for: 2025-02-28 03:00 PM: Undergraduate Paper Session I-2 #4 in Phillips 215

Status: Accepted

Collection: Undergraduate Presentations

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