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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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<?xml version="1.0" encoding="UTF-8"?>

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<!DOCTYPE Book SYSTEM "gapdoc.dtd"

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    [ <!ENTITY Congruence "<Package>Congruence</Package>">

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      <#Include Label="PKGVERSIONDATA">      

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    ] >

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<Book Name="Congruence">

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  <TitlePage>

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    <Title>&Congruence;</Title>

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    <Subtitle>Congruence subgroups of <M>SL_2(&ZZ;)</M></Subtitle>

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    <Version>Version &VERSION;</Version>

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    <Author>Ann Dooms

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      <Email>[email protected]</Email>

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      <Homepage>http://homepages.vub.ac.be/&tilde;andooms</Homepage>

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      <Address>

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        Department of Mathematics, Vrije Universiteit Brussel<Br/>

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        Pleinlaan 2, Brussels, B-1050 Belgium

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      </Address>

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    </Author>

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    <Author>Eric Jespers

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      <Email>[email protected]</Email>

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      <Homepage>http://homepages.vub.ac.be/&tilde;efjesper</Homepage>

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      <Address>

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        Department of Mathematics, Vrije Universiteit Brussel<Br/>

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        Pleinlaan 2, Brussels, B-1050 Belgium

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      </Address>

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    </Author>

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    <Author>Alexander Konovalov

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      <Email>[email protected]</Email>

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      <Homepage>https://alexk.host.cs.st-andrews.ac.uk</Homepage>

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      <Address>

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        School of Computer Science<Br/>

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        University of St Andrews<Br/>

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        Jack Cole Building, North Haugh,<Br/>

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        St Andrews, Fife, KY16 9SX, Scotland

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      </Address> 

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    </Author>

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    <Author>Helena Verrill

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      <Email>[email protected]</Email>

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      <Homepage>http://www.math.lsu.edu/&tilde;verrill/</Homepage>

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      <Address>

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        Department of Mathematics<Br/>

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        Louisiana State University<Br/>

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        Baton Rouge, Louisiana, 70803-4918<Br/>

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        USA

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      </Address>

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    </Author>

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  <Date>&RELEASEDATE;</Date>

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    <Abstract>

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      <Index Key="Congruence package">&Congruence; package</Index>

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      The &GAP; package &Congruence; provides functionality to

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      work with congruence subgroups of <M>SL_2(&ZZ;)</M>.

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    </Abstract>

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    <Copyright>

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      &copyright; 2006-&RELEASEYEAR; by Ann Dooms, Eric Jespers, 

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                  Alexander Konovalov and Helena Verrill.<P/>

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      &Congruence; is free software; you can redistribute it and/or modify it

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      under the terms of the GNU General Public License as published by

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      the Free Software Foundation; either version 2 of the License, or

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      (at your option) any later version. For details, see the FSF's own site

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      <URL>http://www.gnu.org/licenses/gpl.html</URL>.<P/>

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      If you obtained &Congruence;, we would be grateful for a short notification

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      sent to one of the authors.<P/>

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      If you publish a result which was partially obtained with the usage of

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      &Congruence;, please cite it in the following form:<P/>

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      A. Dooms, E. Jespers, A. Konovalov and H. Verrill.

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      <E>Congruence --- Congruence subgroups of <M>SL_2(&ZZ;)</M>, Version &VERSION;;</E>

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      &RELEASEYEAR; (<URL>http://www.cs.st-andrews.ac.uk/&tilde;alexk/congruence/</URL>).

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    </Copyright>

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    <Acknowledgements>

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      We are very grateful to Mong-Lung Lang, Chong-Hai Lim and Ser Peow Tan

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      for their comments provided while implementing algorithms from 

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      <Cite Key="LLT-Algorithm" /> and <Cite Key="LLT-Hecke" />, and to 

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      Francqui Stichting (Belgium) for the support of the third author.

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    </Acknowledgements>

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  </TitlePage>

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  <TableOfContents/>

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  <Body>

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    <#Include SYSTEM "intro.xml">

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    <#Include SYSTEM "cong.xml">

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    <#Include SYSTEM "farey.xml">

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    <#Include SYSTEM "gens.xml">

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    <#Include SYSTEM "service.xml">

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  </Body>

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  <Bibliography Databases="manual"/>

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  <TheIndex/>

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</Book>

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