A minimal non-distal system with trivial order-two regional proximal relation

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For a topological dynamical system (X,T)(X,T), let AP[2](X,T)\textbf{AP}^{[2]}(X,T) denote its order-two approximate proximal relation and let ΔX=(x,x):x∈X\Delta_X=\\{(x,x):x\in X\\}. Approximate-proximality conjecture. There is a minimal system (X,T)(X,T) such that

AP[2](X,T)=ΔX\textbf{AP}^{[2]}(X,T)=\Delta_X

and (X,T)(X,T) is not distal. This asks whether trivial order-two approximate proximality can coexist with failure of distality. The source provides no resolution.

References

Primary source

Eli Glasner, Wen Huang, Song Shao, Benjamin Weiss and Xiangdong Ye, “Topological characteristic factors and nilsystems”, arXiv:2006.12385 (2020).

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