The Markov-partition conjecture for the Jeandel–Rao toral rotation

Let P0\mathcal{P}_0 be the toroidal partition associated with the Jeandel–Rao Wang shift, let Γ0\Gamma_0 be the corresponding lattice, and let R0R_0 denote the associated Z2\mathbb{Z}^2-rotation on R2/Γ0\mathbb{R}^2/\Gamma_0. A partition is a Markov partition for this system when it has the Markov property with respect to the Z2\mathbb{Z}^2-action and rotation. Markov-partition conjecture. The partition P0\mathcal{P}_0 is a Markov partition for

(R2/Γ0,Z2,R0).(\mathbb{R}^2/\Gamma_0,\mathbb{Z}^2,R_0).

The conjecture would complete the identification of the minimal subshift X0X_0 with XP0,R0\mathcal{X}_{\mathcal{P}_0,R_0} and establish the stated symbolic coding as a Markov partition for the toral Z2\mathbb{Z}^2-rotation. The source says that this equality and the resulting statement are deferred to later work, so the conjecture is presented as open.

Sources & referencesView supporting material

Primary source

Sébastien Labbé, “Markov partitions for toral Z^2-rotations featuring Jeandel-Rao Wang shift and model sets”, arXiv:1903.06137 (2020).

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