Abstract
In this paper we introduce some infinite rectangle exchange transformations which are based on the simultaneous turning of the squares within a sequence of square grids. We will show that such noncompact systems have higher dimensional dynamical compactifications. In good cases, these compactifications are polytope exchange transformations based on pairs of Euclidean lattices. In each dimension \(8m+4\) there is a \(4m+2\) dimensional family of them. Here \(m=0,1,2,\ldots \) We studied the case \(m=0\) in depth in Schwartz (The octagonal PETs, research monograph, 2012).
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Notes
Somewhat later on, we will find it more useful to set \(z_1=(1+i)/2\), to that the origin is the center of a square of the first grid, rather than a vertex of the grid.
Note that the maps \(H(A_i)\) are rigid motions of the plane. They are not directly related to the square turning maps defined above.
We often find it more convenient to work in \({\varvec{C}}^k\) rather than \({\varvec{R}}^{2k}\), even though sometimes we will make the identification of \({\varvec{C}}^k\) with \({\varvec{R}}^{2k}\).
There is a certain redundancy, in the sense that the data \(\{\lambda s_1,\ldots ,\lambda s_n\}\) leads to a system which is conjugate to the system defined by \(\{s_1,\ldots ,s_n\}\). So, perhaps it is more accurate to say that there is a \(4m+1\) dimensional family of examples in dimension \(8m+4\).
Not all double lattice PETs can be specified this way, but the ones here can be.
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Acknowledgements
I would like to thank Nicolas Bedaride, Pat Hooper, Injee Jeong, John Smillie, and Sergei Tabachnikov for interesting conversations about topics related to this work. I wrote this paper during my sabbatical at Oxford in 2012-20-13. I would especially like to thank All Souls College, Oxford, for providing a wonderful research environment. My sabbatical was funded from many sources. I would like to thank the National Science Foundation, All Souls College, the Oxford Maths Institute, the Simons Foundation, the Leverhulme Trust, the Chancellor’s Professorship, and Brown University for their support during this time period.
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Supported by N.S.F. Research Grant DMS-0072607.
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Schwartz, R.E. Square turning maps and their compactifications. Geom Dedicata 192, 295–325 (2018). https://doi.org/10.1007/s10711-017-0246-9
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DOI: https://doi.org/10.1007/s10711-017-0246-9