Low Dimensional Topology

September 30, 2013

SnapPy 2.0 released

Marc Culler and I pleased to announce version 2.0 of SnapPy, a program for studying the topology and geometry of 3-manifolds. Many of the new features are graphical in nature, so we made a new tutorial video to show them off. Highlights include

  • A manifold browser window for easily examining a particular manifold.
  • Many improvements to the link editor, including
    • A smoothed view mode with image export to EPS/PDF/SVG/TikZ.
    • Producing a fully editable link from combinatorial data like a DT code.
  • Splitting manifolds along surfaces of non-negative euler characteristic.
  • Generalizing the ptolemy obstruction class to allow computation of PGL(3,C)-representations and improving usability of the ptolemy module.
  • CensusKnots now includes knot exteriors with 8 tetrahedra.

As always, you can get the new version here.


  1. Thanks Nathan! Is there any chance a future release of SnapPy could include Orb? (i.e. could handle graphs and not just links?)

    Comment by Scott Taylor — October 9, 2013 @ 12:29 pm | Reply

    • Marc Culler and I were talking about the possibility of including Orb recently. It seems like it would be straightforward but probably a fair amount work. So hopefully eventually, but probably not in the next release.

      Comment by Nathan Dunfield — October 9, 2013 @ 1:09 pm | Reply

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