Equilateral stick number of knots

Hyoungjun Kim, Sungjong No, Seung Sang Oh

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

An equilateral stick number s<inf>=</inf>(K) of a knot K is defined to be the minimal number of sticks required to construct a polygonal knot of K which consists of equal length sticks. Rawdon and Scharein [Upper bounds for equilateral stick numbers, in Physical Knots: Knotting, Linking, and Folding Geometric Objects in R<sup>3</sup>, Contemporary Mathematics, Vol. 304 (American Mathematical Society, Providence, RI, 2002), pp. 55-76] found upper bounds for the equilateral stick numbers of all prime knots through 10 crossings by using algorithms in the software KnotPlot. In this paper, we find an upper bound on the equilateral stick number of a non-trivial knot K in terms of the minimal crossing number c(K) which is s<inf>=</inf>(K) ≤ 2c(K) + 2. Moreover if K is a non-alternating prime knot, then s<inf>=</inf>(K) ≤ 2c(K) - 2. Furthermore we find another upper bound on the equilateral stick number for composite knots which is s<inf>=</inf>(K<inf>1</inf>#K<inf>2</inf>) ≤ 2c(K<inf>1</inf>) + 2c(K<inf>2</inf>).

Original languageEnglish
Article number1460008
JournalJournal of Knot Theory and its Ramifications
Volume23
Issue number7
DOIs
Publication statusPublished - 2014 Jun 25

Keywords

  • equilateral stick number
  • Knot
  • stick number
  • upper bound

ASJC Scopus subject areas

  • Algebra and Number Theory

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