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

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#############################################################################
##
#W PackageInfo.g           The Congruence package                   Ann Dooms
#W                                                               Eric Jespers
#W                                                        Alexander Konovalov
#W                                                             Helena Verrill
##
##
#############################################################################

SetPackageInfo( rec(

PackageName    := "Congruence",
Subtitle       := "Congruence subgroups of SL(2,Integers)",
Version        := "1.2.1",
Date           := "26/09/2017",
##  <#GAPDoc Label="PKGVERSIONDATA">
##  <!ENTITY VERSION "1.2.1">
##  <!ENTITY RELEASEDATE "26 September 2017">
##  <!ENTITY RELEASEYEAR "2017">
##  <#/GAPDoc>

SourceRepository := rec(
    Type := "git",
    URL := Concatenation( "https://github.com/gap-packages/", LowercaseString(~.PackageName) ),
),
IssueTrackerURL := Concatenation( ~.SourceRepository.URL, "/issues" ),
PackageWWWHome  := Concatenation( "https://gap-packages.github.io/", LowercaseString(~.PackageName) ),
README_URL      := Concatenation( ~.PackageWWWHome, "/README.md" ),
PackageInfoURL  := Concatenation( ~.PackageWWWHome, "/PackageInfo.g" ),
ArchiveURL      := Concatenation( ~.SourceRepository.URL,
                                 "/releases/download/v", ~.Version,
                                 "/", LowercaseString(~.PackageName), "-", ~.Version ),

ArchiveFormats := ".tar.gz",

Persons := [
  rec(
    LastName      := "Dooms",
    FirstNames    := "Ann",
    IsAuthor      := true,
    IsMaintainer  := true,
    Email         := "[email protected]",
    WWWHome       := "http://homepages.vub.ac.be/~andooms",
    PostalAddress := Concatenation( [
                     "Department of Mathematics\n",
                     "Vrije Universiteit Brussel\n", 
                     "Pleinlaan 2, Brussels, B-1050 Belgium" ] ),
    Place         := "Brussels",
    Institution   := "Vrije Universiteit Brussel"
     ),     
  rec(
    LastName      := "Jespers",
    FirstNames    := "Eric",
    IsAuthor      := true,
    IsMaintainer  := false,
    Email         := "[email protected]",
    WWWHome       := "http://homepages.vub.ac.be/~efjesper",
    PostalAddress := Concatenation( [
                     "Department of Mathematics\n",
                     "Vrije Universiteit Brussel\n", 
                     "Pleinlaan 2, Brussels, B-1050 Belgium" ] ),
    Place         := "Brussels",
    Institution   := "Vrije Universiteit Brussel"
     ),
  rec(
    LastName      := "Konovalov",
    FirstNames    := "Alexander",
    IsAuthor      := true,
    IsMaintainer  := true,
    Email         := "[email protected]",
    WWWHome       := "https://alexk.host.cs.st-andrews.ac.uk",
    PostalAddress := Concatenation( [
                     "School of Computer Science\n",
                     "University of St Andrews\n",
                     "Jack Cole Building, North Haugh,\n",
                     "St Andrews, Fife, KY16 9SX, Scotland" ] ),
    Place         := "St Andrews",
    Institution   := "University of St Andrews"
     ),
  rec(    
    LastName      := "Verrill",
    FirstNames    := "Helena",
    IsAuthor      := true,
    IsMaintainer  := true,
    Email         := "[email protected]",
    WWWHome       := "http://www.math.lsu.edu/~verrill",
    PostalAddress := Concatenation( [
                     "Department of Mathematics\n",
                     "Louisiana State University\n",
                     "Baton Rouge, Louisiana, 70803-4918\n",
                     "USA" ] ),
    Place         := "Baton Rouge",
    Institution   := "Louisiana State University"
     )      
],

Status := "accepted",
CommunicatedBy := "Graham Ellis (Galway)",
AcceptDate := "09/2014",

AbstractHTML := "The <span class=\"pkgname\">Congruence </span> package provides functions to construct several types of canonical congruence subgroups in SL_2(Z), and also intersections of a finite number of such subgroups. Furthermore, it implements the algorithm for generating Farey symbols for congruence subgroups and using them to produce a system of independent generators for these subgroups",
                  
PackageDoc := rec(
  BookName := "Congruence",
  ArchiveURLSubset := ["doc"],
  HTMLStart := "doc/chap0.html",
  PDFFile := "doc/manual.pdf",
  SixFile := "doc/manual.six",
  LongTitle := "Congruence subgroups of SL(2,Integers)",
  Autoload := true
),

Dependencies := rec(
  GAP := ">=4.8",
  NeededOtherPackages := [ ["GAPDoc", ">= 1.5.1"] ],
  SuggestedOtherPackages := [],
  ExternalConditions := []
),

AvailabilityTest := ReturnTrue,
TestFile := "tst/testall.g",

Keywords := ["congruence subgroup", "Farey symbol"]
));