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Covering Maps and Periodic Functions on Higher Dimensional Sierpinski Gaskets

Published online by Cambridge University Press:  20 November 2018

Huo-Jun Ruan  and
Robert S. Strichartz
Huo-Jun Ruan
Affiliation:
(Ruan) Department of Mathematics, Zhejiang University, Hangzhou, 310027, China and Department of Mathematics, Cornell University, Ithaca, New York 14853, U.S.A., e-mail: ruanhj@zju.edu.cn
Robert S. Strichartz
Affiliation:
(Strichartz) Department of Mathematics, Cornell University, Ithaca, New York 14853, U.S.A., e-mail: str@math.cornell.edu
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Abstract

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We construct covering maps from infinite blowups of the $n$-dimensional Sierpinski gasket $S{{G}_{n}}$ to certain compact fractafolds based on $S{{G}_{n}}$. These maps are fractal analogs of the usual covering maps fromthe line to the circle. The construction extends work of the second author in the case $n=2$, but a differentmethod of proof is needed, which amounts to solving a Sudoku-type puzzle. We can use the covering maps to define the notion of periodic function on the blowups. We give a characterization of these periodic functions and describe the analog of Fourier series expansions. We study covering maps onto quotient fractalfolds. Finally, we show that such covering maps fail to exist for many other highly symmetric fractals.

Keywords

28A80
Type
Research Article
Information
Canadian Journal of Mathematics , Volume 61 , Issue 5 , 01 October 2009 , pp. 1151 - 1181
Copyright
Copyright © Canadian Mathematical Society 2009

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