News

  • Version 3.1 (May 2023):

    • A method exterior_to_link for going from a link exterior to a link diagram taken from Dunfield-Obeidin-Rudd.

    • Covers now computed by the stand-alone low_index module, which uses multiple processor cores and is typically much faster than the old code. In some cases, it is dramatically faster than even GAP or Magma.

    • Added geodesics to the inside_view.

    • Added drilling any simple geodesic with drill_word and drill_words, not just those that are combinatorially simple.

    • Added ignore_orientation flag to triangulation_isosig.

    • Added include_words flag to length_spectrum for getting the word corresponding to a geodesic which can be given to drill_word.

    • Support for Python 3.11 and SageMath 10.0.

    • Modernized styling of the documentation.

  • Version 3.0.3 (December 2021):

    • Runs natively on Macs with Apple Silicon processors (M1, M2, and variants).

  • Version 3.0.2 (November 2021):

    • Support for SageMath 9.4 and 9.5, Python 3.10, and macOS Monterey.

  • Version 3.0 (April 2021): New features include:

    • Incorporates Zoltán Szabó’s program for computing Knot Floer homology, see knot_floer_homology. This can compute the Seifert genus of a 25 crossing knot in mere seconds!

    • Topological slice obstructions of Herald-Kirk-Livingston, see slice_obstruction_HKL.

    • Faster “local” algorithm for jones_polynomial.

    • Cohomology fractals added to inside_view.

    • Convention changes: Sign of knot signature (now positive knots have negative signatures), choice of braid generators (now positive generators give positive crossings).

    • Updates to methods cusp_translations, cusp_areas, short_slopes. Also Link now accepts DT codes.

    • Support for SageMath 9.3, Python 3.9, and macOS Big Sur.

    • macOS app now code-signed and notarized.

    • SnapPy now requires Python 3.6 or newer.

  • Version 2.8 (June 2020): New features include:

  • Version 2.7 (July 2019): New features include:

    • Python 3 is now recommended over Python 2 on all platforms; the default Mac and Windows apps use Python 3 rather than Python 2. The only difference most users will notice is that one must type print(blah) instead of print blah.

    • Verified computations: performance improvements by switching to the Krawczyk test.

    • Support for SageMath 8.8.

    • Installation instructions extensively updated.

    • GUI improvements, especially on macOS. These include improved support for dark mode and tabs on macOS Mojave and preliminary support for macOS Catalina.

  • Version 2.6.1 (August 2018): New features include:

  • Version 2.6 (Nov 2017): New features include:

    • Support for macOS High Sierra, SageMath 8.1, and Windows systems using non-Latin alphabets.

    • Many bug fixes, including improved Python 3 support.

  • Version 2.5 (Feb 2017): New features include:

    • Rigorous computation of hyperbolic volume.

    • STL export of Dirichlet domains for 3D printing, contributed by Jose Sanchez.

    • Support for Python 3, SageMath 7.5, 7.6, and 8.0, and many more versions of Python on Windows.

    • Much improved infrastructure for testing and distributing SnapPy.

  • Version 2.4 (May 2016): New features include:

  • Version 2.3 (March 2015): 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.

  • Version 2.2 (June 2014): Includes Ben Burton’s census of orientable cusped manifolds with 9 tetrahedra.

  • Version 2.1 (February 2014): New high-precision manifolds (ManifoldHP) which compute hyperbolic structures (and everything related) in quad-double (212 bit) precision.

  • Version 2.0 (September 2013): Many new features, including:

    • 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.

  • Version 1.8 (May 2013) improves handling of DT codes and adds the HTLinkExteriors census, which provides identification for knots and links up to 14 crossings.

  • Version 1.7 (November 2012) incorporates the ptolemy module for studying representations of 3-manifold groups into pSL(N, C).

  • Version 1.6 (August 2012) includes a new way to make links and some support for arbitrary precision calculation.

  • Version 1.5 (February 2012) includes much improved manifold censuses.

  • Version 1.4 (December 2011) uses the current release of IPython, which has been completely rewritten.

  • Version 1.3.10 (July 2011) incorporates Twister.

  • Version 1.3 (February 2011) has a completely redesigned cusp horoball viewer and many bug fixes!

  • Version 1.2 (December 2010).

  • Version 1.1 (February 2010).

  • Version 1.0 (August 2009) Initial version.