/usr/share/gap/pkg/Polycyclic/gap/basic/pcpgrps.gd is in gap-polycyclic 2.11-3.
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#W pcpgrps.gd Polycyc Bettina Eick
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## Declare pcp groups as groups of pcp elements.
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DeclareSynonym( "IsPcpGroup", IsGroup and IsPcpElementCollection );
InstallTrueMethod( IsPolycyclicGroup, IsPcpGroup );
InstallTrueMethod( CanEasilySortElements, IsPcpGroup );
InstallTrueMethod( KnowsHowToDecompose, IsPcpGroup );
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## An igs/ngs/cgs is an attribute of a pcp group.
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DeclareAttribute( "Igs", IsPcpGroup );
DeclareAttribute( "Ngs", IsPcpGroup );
DeclareAttribute( "Cgs", IsPcpGroup );
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## Some global functions
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DeclareGlobalFunction( "PcpGroupByCollectorNC" );
DeclareGlobalFunction( "PcpGroupByCollector" );
DeclareGlobalFunction( "LinearActionOnPcp" );
DeclareGlobalFunction( "SubgroupByIgs" );
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