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

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  13 External packages
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  The use of the packages NormalizInterface [GHS14] (an interface to Normalize
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  [BIRC14];  or in its absence 4ti2Interface[Gut], and interface to 4ti2[tt]),
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  SingularInterface  (an  interface  to  Singular  [DGPS12]; or in its absence
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  Singular  [CdG12]);  or  in  its  absence  GradedModules  [BGJ+14] is highly
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  recommended  for  many  of the functions presented in this chapter. However,
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  whenever  possible a method not depending on these packages is also provided
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  (though  slower).  The  package  tests if the user has downloaded any of the
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  above  packages,  and if so puts NumSgpsCanUsePackage to true, where Package
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  is any of the above.
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  13.1 Using external packages
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  As  mentioned  above  some  methods  are  specifically  implemented  to take
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  advantage  of several external packages. The following functions can be used
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  in case these packages have not been loaded prior to numericalsgps.
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  13.1-1 NumSgpsUse4ti2
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  NumSgpsUse4ti2(  )  function
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  Tries  to  load the package 4ti2Interface. If the package is available, then
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  it also loads methods implemented using functions in this package.
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  13.1-2 NumSgpsUse4ti2gap
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  NumSgpsUse4ti2gap(  )  function
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  Tries to load the package 4ti2gap. If the package is available, then it also
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  loads methods implemented using functions in this package.
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  13.1-3 NumSgpsUseNormalize
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  NumSgpsUseNormalize(  )  function
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  Tries  to  load  the package NormalizInterface. If the package is available,
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  then it also loads methods implemented using functions in this package.
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  13.1-4 NumSgpsUseSingular
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  NumSgpsUseSingular(  )  function
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  Tries  to  load  the  package singular. If the package is available, then it
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  also loads methods implemented using functions in this package.
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  To prevent incompatibilities, the package will not load if SingularInterface
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  has been already loaded.
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  13.1-5 NumSgpsUseSingularInterface
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  NumSgpsUseSingularInterface(  )  function
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  Tries  to  load  the package SingularInterface. If the package is available,
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  then it also loads methods implemented using functions in this package.
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  To prevent incompatibilities, the package will not load if singular has been
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  already loaded.
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  13.1-6 NumSgpsUseSingularGradedModules
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  NumSgpsUseSingularGradedModules(  )  function
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  Tries  to  load the package GradedModules. If the package is available, then
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  it also loads methods implemented using functions in this package.
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  It also creates a ring of rationals NumSgpsRationals.
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