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Rauzy induction of polygon partitions and toral $ \mathbb{Z}^2 $-rotations

The author acknowledges financial support from the Laboratoire International FrancoQuébécois de Recherche en Combinatoire (LIRCO), the Agence Nationale de la Recherche through the project CODYS (ANR-18-CE40-0007) and the Horizon 2020 European Research Infrastructure project OpenDreamKit (676541)

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  • We extend the notion of Rauzy induction of interval exchange transformations to the case of toral $ \mathbb{Z}^2 $-rotation, i.e., $ \mathbb{Z}^2 $-action defined by rotations on a 2-torus. If $ \mathscr{X}_{\mathscr{P}, R} $ denotes the symbolic dynamical system corresponding to a partition $ \mathscr{P} $ and $ \mathbb{Z}^2 $-action $ R $ such that $ R $ is Cartesian on a sub-domain $ W $, we express the 2-dimensional configurations in $ \mathscr{X}_{\mathscr{P}, R} $ as the image under a $ 2 $-dimensional morphism (up to a shift) of a configuration in $ \mathscr{X}_{\widehat{\mathscr{P}}|_W, \widehat{R}|_W} $ where $ \widehat{\mathscr{P}}|_W $ is the induced partition and $ \widehat{R}|_W $ is the induced $ \mathbb{Z}^2 $-action on $ W $.

    We focus on one example, $ \mathscr{X}_{\mathscr{P}_0, R_0} $, for which we obtain an eventually periodic sequence of 2-dimensional morphisms. We prove that it is the same as the substitutive structure of the minimal subshift $ X_0 $ of the Jeandel–Rao Wang shift computed in an earlier work by the author. As a consequence, $ {\mathscr{P}}_0 $ is a Markov partition for the associated toral $ \mathbb{Z}^2 $-rotation $ R_0 $. It also implies that the subshift $ X_0 $ is uniquely ergodic and is isomorphic to the toral $ \mathbb{Z}^2 $-rotation $ R_0 $ which can be seen as a generalization for 2-dimensional subshifts of the relation between Sturmian sequences and irrational rotations on a circle. Batteries included: the algorithms and code to reproduce the proofs are provided.

    Mathematics Subject Classification: 37A05.

    Citation:

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  • Figure 1.  The shifted lattice $ p+ \mathbb{Z} $ is coded as a bi-infinite binary sequence $ w\in\{L, R\}^ \mathbb{Z} $ which is a symbolic representation of $ p $

    Figure 2.  The automorphism of $ \mathbb{R}^2/ \mathbb{Z}^2 $ defined as $ v\mapsto Mv $ admits a Markov partition

    Figure 3.  For every starting point $ p\in \mathbb{R}^2 $, the coding of the shifted lattice $ p+ \mathbb{Z}^2 $ under the polygon partition $ {\mathscr{P}}_0 $ yields a configuration which is a symbolic representation of $ p $. We show that the set of such configurations is a shift of finite type (SFT) and hence that $ {\mathscr{P}}_0 $ is a Markov partition for the toral $ \mathbb{Z}^2 $-rotation $ R_0 $

    Figure 4.  We prove that the subshifts $ X_0\subset\Omega_0 $ and $ {\mathscr{X}}_{ {\mathscr{P}}_0, R_0} $ are equal since they have a common substitutive structure. The substitutive structure of $ X_0 $ computed in [36] and the substitutive structure of $ {\mathscr{X}}_{ {\mathscr{P}}_0, R_0} $ satisfy $ \beta_0 = \omega_0\omega_1\omega_2\omega_3 $, $ \beta_1\beta_2 = \jmath\, \eta\, \omega_6 $, $ \beta_3 \beta_4 \beta_5 \beta_6 \beta_7 = \omega_7 \omega_8 \omega_9 \omega_{10} \omega_{11} $, $ \zeta = \rho $ and $ \beta_8\, \beta_9\, \tau = \rho\, \omega_ {\mathscr{U}}\, \rho^{-1} $. We deduce that $ {\mathscr{X}}_{ {\mathscr{P}}_8, R_8} = \Omega_{12} $, $ {\mathscr{X}}_{ {\mathscr{P}}_3, R_3} = \Omega_{7} $, $ {\mathscr{X}}_{ {\mathscr{P}}_1, R_1} = X_{4} $ and finally $ {\mathscr{X}}_{ {\mathscr{P}}_0, R_0} = X_{0} $

    Figure 5.  The polygon exchange transformation $ T $ of the rectangle $ [0, \ell_1)\times[0, \ell_2) $ as defined on the figure can be seen as a toral translation by the vector $ (\alpha_1, \alpha_2) $ on the torus $ \mathbb{R}^2/(\ell_1 \mathbb{Z}\times\ell_2 \mathbb{Z}) $

    Figure 6.  The partition $ {\mathscr{P}}_0 $ of $ \mathbb{R}^2/\Gamma_0 $ into atoms associated to letters in $ {\mathscr{A}}_0 $ illustrated on a rectangular fundamental domain

    Figure 7.  The set $ \{A, B, C, D\} $ forms a partition of the rectangle $ W = (0, \varphi)\times(0, 1) $. The return time to $ W $ under the map $ R_0^{ {\boldsymbol{e}}_2} $ is 4 or 5. The orbit of $ A $, $ B $, $ C $ and $ D $ under $ R_0^{ {\boldsymbol{e}}_2} $ before it returns to $ W $ yields a partitions of $ \mathbb{R}^2/\Gamma_0 $. The first return map $ \widehat{R_0^{ {\boldsymbol{e}}_2}}|_W $ is equivalent to a toral translation by the vector $ (\frac{1}{\varphi}, \frac{1}{\varphi^2}) $ on $ \mathbb{R}^2/\Gamma_1 $

    Figure 8.  The return time to $ W $ under map $ R_0^{ {\boldsymbol{e}}_1} $ is always 1. The first return map $ \widehat{R_0^{ {\boldsymbol{e}}_1}}|_W $ is equivalent to a toral translation by the vector $ (1, 0) $ on $ \mathbb{R}^2/\Gamma_1 $

    Figure 9.  The partition $ {\mathscr{P}}_1: = \widehat{ {\mathscr{P}}_0}|_W $ of $ \mathbb{R}^2/\Gamma_1 $ into 30 convex atoms each associated to one of the 28 letters in $ {\mathscr{A}}_1 $ (indices 19 and 22 are both used twice)

    Figure 10.  The partition $ {\mathscr{P}}_2 $ of $ \mathbb{R}^2/\Gamma_2 $ into atoms associated to letters in $ {\mathscr{A}}_2 $

    Figure 11.  The substitutive structure of $ {\mathscr{X}}_{ {\mathscr{P}}_2, R_2} $

    Figure 12.  The topological partition $ {\mathscr{P}}_ {\mathscr{U}} $ of $ \mathbb{T}^2 $ using alphabet $ \left[\!\left[ {0, {18}} \right]\!\right] $ for the atoms

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