# The Regina Handbook

Benjamin Burton `<bab@maths.uq.edu.au>`

Revision 5.1 (2016-12-19)

Copyright © 1999–2016 The Regina development team

Both Regina and this handbook are licensed under the terms of the GNU General Public License.

Regina is a software package for 3-manifold and 4-manifold topologists, with a focus on triangulations, normal surfaces and angle structures. For 3-manifolds, it includes high-level tasks such as 3-sphere recognition, connected sum decomposition and Hakenness testing, comes with a rich database of census manifolds, and incorporates the SnapPea kernel for working with hyperbolic manifolds. For 4-manifolds, it offers a range of combinatorial and algebraic tools, plus support for normal hypersurfaces. Regina comes with a full graphical user interface, as well as Python bindings and a low-level C++ programming interface.

This handbook is current as of Regina 5.1.

Tip: You can also browse the alphabetical index of tasks.