Finite-index subgroups of (P)SL(2,Integers)
Version 2.0.2
Released 2026-05-04
This project is maintained by Sebastian Engelhardt, Hannah Wagmann, Gabriela Weitze-Schmithüsen
This package provides a collection of algorithms for computing with finite-index subgroups of (P)SL(2,Z).
The current version of this package is version 2.0.2, released on 2026-05-04. For more information, please refer to the package manual. There is also a README file.
License: GPL-3.0-or-later
This package requires GAP version 4.12
The following other GAP packages are needed:
Sebastian Engelhardt, Luca Leon Junk, Hannah Wagmann, Gabriela Weitze-Schmithüsen.
Please, cite this package as
[EJWW26] Engelhardt, S., Junk, L. L., Wagmann, H. and Weitze-Schmithüsen, G.,
ModularGroup, Finite-index subgroups of (P)SL(2,Integers),
Version 2.0.2
(2026)
(GAP package),
https://ag-weitze-schmithusen.github.io/ModularGroup.
You can get more info by typing Cite("ModularGroup"); in the gap prompt.
For bug reports, feature requests and suggestions, please use the issue tracker.