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Topological Dynamics and Continuum Theory

Dynamics/CT Session #5 #3

Subevent of Dynamics/CT Session #5

Central Time (US & Canada)

Starts at: 2025-08-14 09:30AM

Ends at: 2025-08-14 09:55AM

Speedups of Toeplitz Flows

Lori Alvin ⟨lori.alvin@furman.edu⟩

Abstract:

Given a minimal Cantor system (X,T), a topological speedup of (X,T) is a dynamical system (X,S) where S is a homeomorphism such that S(x)=Tp(x)(x) for some function p:XN. We assume the function p is continuous (and thus bounded) and the resulting system (X,S) is minimal. One can ask what properties of the underlying initial system (X,T) are preserved under minimal bounded speedups. We investigate the class of Toeplitz flows, which are minimal symbolic almost one-to-one extensions of odometers. Although the minimal bounded speedup of an odometer is always a conjugate odometer, we demonstrate that the minimal bounded speedup of a Toeplitz flow need not be Toeplitz. We then provide sufficient conditions to guarantee that the minimal bounded speedup will be a Toeplitz flow; in this case, it is never conjugate to the original Toeplitz flow but has the same underlying odometer.

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