Douglas J. LaFountain

  1. Studying uniform thickness I: Legendrian simple iterated torus knots.

    Authors: Douglas J. LaFountain
    Subjects: Geometric Topology
    Abstract

    We prove that the class of topological knot types that are both Legendrian
    simple and satisfy the uniform thickness property (UTP) is closed under
    cabling. An immediate application is that all iterated cabling knot types that
    begin with negative torus knots are Legendrian simple. We also examine, for
    arbitrary numbers of iterations, iterated cablings that begin with positive
    torus knots, and establish the Legendrian simplicity of large classes of these
    knot types, many of which also satisfy the UTP.

  2. Studying uniform thickness II: Transversally non-simple iterated torus knots.

    Authors: Douglas J. LaFountain
    Subjects: Geometric Topology
    Abstract

    We prove that an iterated torus knot type fails the uniform thickness
    property (UTP) if and only if all of its iterations are positive cablings,
    which is precisely when an iterated torus knot type supports the standard
    contact structure. We also show that all iterated torus knots that fail the UTP
    support cabling knot types that are transversally non-simple.

  3. Studying uniform thickness II: Transversally non-simple iterated torus knots.

    Authors: Douglas J. LaFountain
    Subjects: Geometric Topology
    Abstract

    We prove that an iterated torus knot type fails the uniform thickness
    property (UTP) if and only if all of its iterations are positive cablings,
    which is precisely when an iterated torus knot type supports the standard
    contact structure. We also show that all iterated torus knots that fail the UTP
    support cabling knot types that are transversally non-simple.

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