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Prime Link


A prime link is a link that is not a splittable link and for which every representation as a knot sum has an unknot as one of its factors (Hoste 2005). Doll and Hoste (1991) list polynomials for oriented links of nine or fewer crossings, and Rolfsen (1976) gives a table of links with small numbers of components and crossings.

The following table summarizes the number of distinct prime k-component links having specified crossing numbers, with no assigned orientations and with mirror images counted as a single link type.

componentsOEISprime k-component links with 1, 2, ... crossings
1A0028630, 0, 1, 1, 2, 3, 7, 21, 49, 165, 552, ...
2A0489520, 1, 0, 1, 1, 3, 8, 16, 61, 185, 638, ...
3A0489530, 0, 0, 0, 0, 3, 1, 10, 21, 74, 329, ...
4A0870710, 0, 0, 0, 0, 0, 0, 3, 1, 25, 39, ...
50, 0, 0, 0, 0, 0, 0, 0, 0, 3, 1, ...
totalA0867710, 1, 1, 2, 3, 9, 16, 50, 132, 452, 1559, ...

The following table lists some named links. The notation and ordering follows that of Rolfsen (1976), where c_k^r denotes the kth r-component link with link crossing number c.

A listing of the first few simple links follows, arranged by link crossing number.

01

01

01

01

01 02 03

01 02 03 04 05 06 07 08

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61

01 02 03

01

01 02 03 04 05 06 07 08 09 10

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21

01 02 03

01


See also

Andrews-Curtis Link, Borromean Rings, Brunnian Link, Hopf Link, Knot, Link, Oriented Link, Prime Knot, Unlink, Whitehead Link

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References

Bar-Natan, D. "The Thistlethwaite Link Table." https://katlas.org/wiki/The_Thistlethwaite_Link_Table.Doll, H. and Hoste, J. "A Tabulation of Oriented Links." Math. Comput. 57, 747-761, 1991.Hoste, J. "The Enumeration and Classification of Knots and Links." In Handbook of Knot Theory (Ed. W. Menasco and M. Thistlethwaite). Amsterdam, Netherlands: Elsevier, pp. 209-232, 2005. https://pzacad.pitzer.edu/~jhoste/HosteWebPages/downloads/Enumeration.pdf.Rolfsen, D. Knots and Links. Wilmington, DE: Publish or Perish Press, 1976.Scharein, R. G. "Number of Prime Links." https://knotplot.com/manual/PrimeLinks.html.Sloane, N. J. A. Sequences A002863/M0851, A048952, A048953, A086771, and A087071 in "The On-Line Encyclopedia of Integer Sequences."Welsh, D. J. A. "On the Number of Knots and Links." In Sets, Graphs and Numbers (Ed. G. Halász, L. Lovász, D. Miklós, and T. Szőnyi). Amsterdam, Netherlands: North-Holland, pp. 713-718, 1992.

Referenced on Wolfram|Alpha

Prime Link

Cite this as:

Weisstein, Eric W. "Prime Link." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/PrimeLink.html

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