Low Dimensional Topology

March 22, 2015

SnapPy 2.3 released

Marc Culler and I are pleased to announce version 2.3 of SnapPy. New features include:

  • Major improvements to the link and planar diagram component, including link simplification, random links, and better documentation.
  • Basic support for spun normal surfaces.
  • New extra features when used inside of Sage:
  • Better compatibility with OS X Yosemite and Windows 8.1.
  • Development changes:
    • Major source code reorganization/cleanup.
    • Source code repository moved to Bitbucket.
    • Python modules now hosted on PyPI, simplifying installation.

All available at the usual place.

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December 12, 2013

Banker finds a duplication in a 3-manifold table

Filed under: 3-manifolds,Triangulations — Ryan Budney @ 12:48 pm
Tags:

Daniel Moskovich recently wrote about the discovery by a lawyer of a duplication in the knot tables called the “Perko pair”.

Now a banker has found another duplicate in yet another table of 3-manifolds. This time it was Ben Burton, and the duplicate appears in the Hildebrand-Weeks cusped hyperbolic census.

(more…)

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