Marc Culler and
- SnapPy: A user interface to the SnapPea kernel which runs
on Mac OS X, Linux, and Windows. SnapPy combines a link editor and
3D-graphics for Dirichlet domains and cusp neighborhoods with a
powerful command-line interface based on the Python programming
and Full documentation.
Version 1.6 new
in August 2012!
- PLink: A graphical editor for piecewise linear link
projections, which can export DT codes and SnapPea link files. Download/Install and Full documentation. Version 1.1
from June 2009.
- Gridlink: is a graphical tool for manipulating link
projections consisting of vertical and horizontal arcs in the plane.
These projections are used in Ivan Dynnikov's recognition algorithms
for split links and the unknot. They also are used in the
combinatorial description of knot and link Floer homology given first
by C. Manolescu,
P. Ozsvath and S. Sarkar, and explained further by C. Manolescu, P. Ozsvath,
Z. Szabo and D. Thurston. The program can accept a closed braid
description of a link, and can automatically simplify the projection.
It also computes mod 2 Heegaard Floer Knot homology, using the py_hfk
module described below. Packages and installation instructions for
UNIX, OS X, and Windows are on the gridlink home
Last update: 28-Mar-2007
- Heegaard: John Berge's famous program is now available
here. The program can construct a Heegaard diagram from a group
presentation, if the presentation is realizable, and use geometric
T-transformations to simplify the diagram. A 1998
Mac OS9 binary
is available. (Unpack with Stuffit Expander.)
The program has also been ported to gcc. The
gcc port is available in source form, either as a
. Check the README
file for instructions on compiling and using the program. The source
distribution also contains extensive documentation describing the
theory behind how the program works: there is a 30 page article
available as PDF
or TeX. There is also a set of examples in
MAC OS 9
format. The MAC OS 9 version of the program has a graphics
module for drawing Heegaard diagrams. Unfortunately, the graphics is
not yet available in the gcc port.
Last update: 23-Dec-2010
- SnapPeaKernel. As of September 2009, t3m is the proud host
of the official repository for Jeff
Weeks' SnapPea library, on which SnapPy and many other programs
are based. Source code: as a tarball
or as individual files. You can also
access the Mercurial
repository directory via "hg clone http://math.uic.edu/t3m/hg/SnapPeaKernel".
Last update: 9-Sept-2009
- Our extended version of Jeff Week's SnapPeaPython
is available as a
or as individual
files. Requires Python-2.2. Superseded by SnapPy above.
Last update: 25-Jul-2008
The development of this software was partially supported by
the National Science Foundation under
grants numbers 0204142, 007160, 0405491 and 0707136.