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ORIGAMI RINGS

Part of: Algebraic number theory: global fields

Published online by Cambridge University Press:  02 November 2012

JOE BUHLER ,
STEVE BUTLER ,
WARWICK DE LAUNEY  and
RON GRAHAM
JOE BUHLER
Affiliation:
Center for Communications Research, La Jolla, CA 92121, USA (email: buhler@ccrwest.org)
STEVE BUTLER*
Affiliation:
Department of Mathematics, Iowa State University, Ames, IA, 50011, USA (email: butler@iastate.edu)
WARWICK DE LAUNEY
Affiliation:
Center for Communications Research, La Jolla, CA 92121, USA
RON GRAHAM
Affiliation:
Department of Computer Science and Engineering, University of California, San Diego, La Jolla, CA 92093, USA (email: graham@ucsd.edu)
*
✉For correspondence; e-mail: butler@iastate.edu
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Abstract

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Motivated by mathematical aspects of origami, Erik Demaine asked which points in the plane can be constructed by using lines whose angles are multiples of $\pi /n$ for some fixed $n$. This has been answered for some specific small values of $n$ including $n=3,4,5,6,8,10,12,24$. We answer this question for arbitrary $n$. The set of points is a subring of the complex plane $\mathbf {C}$, lying inside the cyclotomic field of $n$th roots of unity; the precise description of the ring depends on whether $n$is prime or composite. The techniques apply in more general situations, for example, infinite sets of angles, or more general constructions of subsets of the plane.

Keywords

origamiringscyclotomic fieldsbinary hybridization

MSC classification

Secondary: 11R04: Algebraic numbers; rings of algebraic integers
Type
Research Article
Information
Journal of the Australian Mathematical Society , Volume 92 , Issue 3 , June 2012 , pp. 299 - 311
Copyright
Copyright © 2012 Australian Mathematical Publishing Association Inc.

References

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