License and Acknowledgements

If you find Regina useful in your research, please consider citing it as you would any other paper that you use. See the section on citing Regina for a suggested form of reference.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

Since version 4.2 (July 2005), Regina includes portions of the SnapPea kernel which it uses for certain geometric calculations. SnapPea is copyright (c) 1991–2005 by Jeff Weeks, who has graciously given permission for it to be distributed under the terms of the GNU General Public License as described above.

Since version 4.3.1 (May 2006), Regina includes snippets of code from Orb for use in importing and exporting files in Orb / Casson format. Orb is based on SnapPea (see above) with additional code written by Damian Heard, who has also given permission for his code to be distributed under the terms of the GNU General Public License.