Version 3.0 (April 2021): New features include:
Topological slice obstructions of Herald-Kirk-Livingston, see
Faster “local” algorithm for
Convention changes: Sign of knot signature (now positive knots have negative signatures), choice of braid generators (now positive generators give positive crossings).
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:
Verified computations: Several new features:
HTLinkExteriorshas been extended to 15 crossing knots (contributed by Malik Obeidin).
CensusKnotshas been extended to triangulations with 9 ideal tetrahedra.
Support for SageMath 9.0 and macOS Catalina.
Development moved to GitHub.
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
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:
Added census of Platonic manifolds.
Rigorous computation of cusp translations.
Added decorations to triangulation isomorphism signatures for encoding peripheral curves.
Faster verification of non-tetrahedral canonical cell decompositions.
Improvements to the link and planar diagram component, mostly contributed by Malik Obeidin, include:
New Windows installer.
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:
HIKMOT-style rigorous verification of hyperbolic structures, contributed by Matthias Goerner.
Many basic knot/link invariants, contributed by Robert Lipschitz and Jennet Dickinson.
Sage-specific functions are now more easily accessible as methods of Manifold and better documented.
Improved number field recognition, thanks to Matthias.
Better compatibility with OS X Yosemite and Windows 8.1.
Version 2.2 (June 2014): Includes Ben Burton’s census of orientable cusped manifolds with 9 tetrahedra.
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 1.5 (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.