Minimum lattice length and ropelength of knots

Kyungpyo Hong, Hyoungjun Kim, Seungsang Oh, Sungjong No

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    Let Len(K) be the minimum length of a knot on the cubic lattice (namely the minimum length necessary to construct the knot in the cubic lattice). This paper provides upper bounds for Len(K) of a nontrivial knot K in terms of its crossing number c(K) as follows: Len(K) ≤ min {3/4c(K)2 + 5c(K) + 17/4, 5/8c(K)2 + 15/2c(K) + 71/8}. The ropelength of a knot is the quotient of its length by its thickness, the radius of the largest embedded normal tube around the knot. We also provide upper bounds for the minimum ropelength Rop(K) which is close to twice Len(K): Rop(K) ≤ min {1.5c(K)2 + 9.15c(K) + 6.79, 1.25c(K)2 + 14.58c(K) + 16.90}.

    Original languageEnglish
    Article number1460009
    JournalJournal of Knot Theory and its Ramifications
    Volume23
    Issue number7
    DOIs
    Publication statusPublished - 2014 Jun 25

    Bibliographical note

    Funding Information:
    The first three authors’ research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (MSIP) (No. 2011-0021795). The fourth author’s work was supported by the BK21 Plus Project through the National Research Foundation of Korea (NRF) funded by the Korean Ministry of Education (22A20130011003).

    Publisher Copyright:
    © 2014 World Scientific Publishing Company.

    Keywords

    • Knot
    • lattice knot
    • ropelength
    • upper bound

    ASJC Scopus subject areas

    • Algebra and Number Theory

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