Spherogram

Spherogram is a Python module for dealing with the kind of planar diagrams that arise in 3-dimensional topology, such as link and Heegaard diagrams. It a component of the larger SnapPy <https://snappy.computop.org> project. For some basic examples of using Spherogram to build links, see here <https://snappy.computop.org/spherogram.html>. You can browse the source code <https://github.com/3-manifolds/Spherogram>_.

Developed by

• Marc Culler <https://marc-culler.info>_
• Nathan Dunfield <http://dunfield.info>_

with contributions from

• Robert Lipshitz <https://pages.uoregon.edu/lipshitz/>_
• Jennet Dickinson
• Malik Obeidin

Also includes third-party libraries:

• Planarity by John Boyer <https://github.com/graph-algorithms/edge-addition-planarity-suite>_
• Planarmap by Gilles Schaeffer <http://www.lix.polytechnique.fr/Labo/Gilles.Schaeffer/PagesWeb/PlanarMap/>_

License

Copyright 2008-present by Marc Culler, Nathan Dunfield, and others.

This code is released under the GNU General Public License, version 2 <https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt>_ or (at your option) any later version as published by the Free Software Foundation.