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ON THE QUASITORIC BRAID INDEX OF A LINK

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We de ne new link invariants which are called the quasitoric braid index and the cyclic length of a link and show that the quasitoric braid index of link with k components is the product of k and the cy- cle length of link. Also, we give bounds of Gordian distance between the (p, q)-torus knot and the closure of a braid of two specific quasitoric braids which are called an alternating quasitoric braid and a blockwise alternat- ing quasitoric braid. We give a method of modi cation which makes a quasitoric presentation from its braid presentation for a knot with braid index 3. By using a quasitoric presentation of 10139 and 10124, we can prove that u(10139) = 4 and d×(10124, K(3, 13)) = 8.

Abstract

We de ne new link invariants which are called the quasitoric braid index and the cyclic length of a link and show that the quasitoric braid index of link with k components is the product of k and the cy- cle length of link. Also, we give bounds of Gordian distance between the (p, q)-torus knot and the closure of a braid of two specific quasitoric braids which are called an alternating quasitoric braid and a blockwise alternat- ing quasitoric braid. We give a method of modi cation which makes a quasitoric presentation from its braid presentation for a knot with braid index 3. By using a quasitoric presentation of 10139 and 10124, we can prove that u(10139) = 4 and d×(10124, K(3, 13)) = 8.

참고문헌 (11)

  1. C. Adams, "The Knot Book" (1994), W. H. Freeman and Company
  2. E. Artin, "Theory of braids", Ann. of Math. (2), 48, pp.101~126 (1947)
  3. W. Gibson, "Links and Gordian numbers associated with generic im-mersions of intervals", Topology Appl, 123(3), pp.609~636 (2002)
  4. C. McA. Gordon, "Signatures of covering links", Canad. J. Math, 33(2), pp.381~394 (1981)
  5. A. Kawauchi, "Distance between links by zero-linking twists", Kobe J. Math, 13(2), pp.183~190 (1996)
  6. P. Kronheimer, "Gauge theory for embedded surfaces I", Topology, 32(4), pp.773~826 (1993)
  7. P. Kronheimer, "Gauge theory for embedded surfaces II", Topology, 34(1), pp.37~97 (1995)
  8. V. O. Manturov, "A combinatorial representation of links by quasitoric braids", European J. Combin, 23(2), pp.207~212 (2002)
  9. K. Murasugi, "A Study of Braids" (1999), Kluwer Academic Publishers
  10. Y. Ohyama, "On the Minimal Crossing Number and the Braid Index of Links", Canad. J. Math, 45(1), pp.117~131 (1993)
  11. K. Taniyama, "Unknotting numbers of diagrams of a given nontrivial knot are unbounded", J. Knot Theory Ramifications, 18(8), pp.1049~1063 (2009)

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