On self-affine tiles whose boundary is a sphere
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- by Jörg Thuswaldner and Shu-qin Zhang PDF
- Trans. Amer. Math. Soc. 373 (2020), 491-527 Request permission
Abstract:
Let $M$ be a $3\times 3$ integer matrix each of whose eigenvalues is greater than $1$ in modulus and let $\mathcal {D}\subset \mathbb {Z}^3$ be a set with $|\mathcal {D}|=|\det M|$, called a digit set. The set equation $MT = T+\mathcal {D}$ uniquely defines a nonempty compact set $T\subset \mathbb {R}^3$. If $T$ has positive Lebesgue measure it is called a $3$-dimensional self-affine tile. In the present paper we study topological properties of $3$-dimensional self-affine tiles with collinear digit set, i.e., with a digit set of the form $\mathcal {D}=\{0,v,2v,\ldots , (|\det M|-1)v\}$ for some $v\in \mathbb {Z}^3\setminus \{0\}$. We prove that the boundary of such a tile $T$ is homeomorphic to a $2$-sphere whenever its set of neighbors in a lattice tiling which is induced by $T$ in a natural way contains $14$ elements. The combinatorics of this lattice tiling is then the same as the one of the bitruncated cubic honeycomb, a body-centered cubic lattice tiling by truncated octahedra. We give a characterization of $3$-dimensional self-affine tiles with collinear digit set having $14$ neighbors in terms of the coefficients of the characteristic polynomial of $M$. In our proofs we use results of R. H. Bing on the topological characterization of spheres.References
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Additional Information
- Jörg Thuswaldner
- Affiliation: Department of Mathematics and Statistics, University of Leoben, Franz-Josef-Strasse 18, A-8700 Leoben, Austria
- MR Author ID: 612976
- ORCID: 0000-0001-5308-762X
- Email: joerg.thuswaldner@unileoben.ac.at
- Shu-qin Zhang
- Affiliation: Department of Mathematics and Statistics, University of Leoben, Franz-Josef-Strasse 18, A-8700 Leoben, Austria
- Email: shuqin.zhang@unileoben.ac.at
- Received by editor(s): November 15, 2018
- Received by editor(s) in revised form: June 6, 2019, and June 18, 2019
- Published electronically: September 23, 2019
- Additional Notes: The authors were supported by FWF project P29910, by FWF-RSF project I3466, and by the FWF doctoral program W1230
Shu-Qin Zhang is the corresponding author - © Copyright 2019 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 373 (2020), 491-527
- MSC (2010): Primary 28A80, 57M50, 57N05; Secondary 51M20, 52C22, 54F65
- DOI: https://doi.org/10.1090/tran/7930
- MathSciNet review: 4042883
Dedicated: Dedicated to Valérie Berthé on the occasion of her 50$^{th}$ birthday