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1 The SmallClassNr package

This is the manual for the GAP 4 package SmallClassNr version 1.7.0, developed by Sam Tertooy.

1.1 Installation

If you are using GAP version 4.15.0 or newer, then SmallClassNr should be installed by default.

If this is not the case, but the PackageManager package is installed and loaded, you can install SmallClassNr from within a GAP session using InstallPackage (PackageManager 2.1-1).

gap> InstallPackage( "SmallClassNr" );
...
true

Alternatively, you can download SmallClassNr as a .tar.gz archive here. After extracting, you should place it in a suitable pkg folder. To install it for just yourself, you can place it in $HOME/.gap/pkg (on many Linux distros) or %USERPROFILE%/_gap/pkg (on Windows). To install it for all users, it must be placed in the GAP installation directory (gap-X.Y.Z/pkg).

1.2 Loading

Once installed, loading SmallClassNr can be done by using LoadPackage (ref 76.2-1).

gap> LoadPackage( "SmallClassNr" );
...
true

1.3 Citing

If you use the SmallClassNr package in your research, we would love to hear about your work via an email to the address sam.tertooy@kuleuven.be. If you have used the SmallClassNr package in the preparation of a paper and wish to refer to it, please cite it as described below.

In BibTeX:

@misc{SCN1.7.0,
    author =       {Tertooy, Sam},
    title =        {{SmallClassNr,
                     Library of finite groups with small class number,
                     Version 1.7.0}},
    note =         {GAP package},
    year =         {2026},
    howpublished = {\url{https://stertooy.github.io/SmallClassNr}}
}

In BibLaTeX:

@software{SCN1.7.0,
    author =   {Tertooy, Sam},
    title =    {SmallClassNr},
    subtitle = {Library of finite groups with small class number},
    version =  {1.7.0},
    note =     {GAP package},
    year =     {2026},
    url =      {https://stertooy.github.io/SmallClassNr}
}

1.4 Support

If you encounter any problems, please submit them to the issue tracker. If you have any questions on the usage or functionality of SmallClassNr, you may contact me via email at sam.tertooy@kuleuven.be.

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