On the Generation of Aperiodic and Periodic Necklaces via T-augmentation

  • Authors:
  • T. Aaron Gulliver;Isaiah Makwakwa;Ulrich Speidel

  • Affiliations:
  • Department of Electrical and Computer Engineering, University of Victoria, Victoria, BC, Canada. E-mail: a.gulliver@ieee.org;School of Mathematics, University College Dublin, Belfield, Dublin 4, Ireland. E-mail: Isaiah.Makwakwa@ucdconnect.ie;Department of Computer Science, The University of Auckland, Auckland, New Zealand. E-mail: ulrich@cs.auckland.ac.nz

  • Venue:
  • Fundamenta Informaticae
  • Year:
  • 2008

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Abstract

In a recent report, Gulliver and Speidel showed that completesets of aperiodic and - in some cases periodic - necklaces can begenerated for arbitrary lengths as fixed-length subsets ofvariable-length T-codes. The T-codes to which they applied thisobservation were specifically T-codes constructed by systematicT-augmentation, that is by T-augmentation sequences in which eachT-expansion parameter is 1 (simple T-augmentation) and where theT-codes A_{(p1,p2,...,pi)} at each Taugmentation level i do notcontain any codewords shorter than pi (strictly minimalT-augmentation). This present paper generalizes their result toarbitrary T-codes and formalizes their earlier result as a specialcase of the general result.