/usr/share/gap/lib/pcgsperm.gd is in gap-libs 4r6p5-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
#W pcgsperm.gd GAP library Heiko Theißen
##
##
#Y Copyright (C) 1997, Lehrstuhl D für Mathematik, RWTH Aachen, Germany
#Y (C) 1998 School Math and Comp. Sci., University of St Andrews, Scotland
#Y Copyright (C) 2002 The GAP Group
##
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#R IsPcgsPermGroupRep . . . . . . . . . . . . . . . . . pcgs of perm group
##
## This is the representation for a pcgs of a perm group which computes
## exponents via a stabilizer chain. It may not be set for subsets (tails)
## as this could lead to wrong exponents.
## The `RelativeOrders' are a defining attribute of a perm group pcgs. They
## cannot be calculated via `PcSeries' and `Size'.
## Every Pcgs for a permutation group is automatically
## `IsFiniteOrdersPcgs'.
##
DeclareRepresentation( "IsPcgsPermGroupRep",
IsPcgsDefaultRep and IsFiniteOrdersPcgs, [ "group", "stabChain" ] );
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##
#R IsModuloPcgsPermGroupRep . . . . . . pcgs of factor group of perm group
##
DeclareRepresentation( "IsModuloPcgsPermGroupRep",
IsPcgsPermGroupRep,
[ "group", "stabChain", "series", "denominator" ] );
DeclareGlobalFunction( "AddNormalizingElementPcgs" );
DeclareGlobalFunction( "ExtendSeriesPermGroup" );
DeclareGlobalFunction( "TryPcgsPermGroup" );
DeclareGlobalFunction( "PcgsStabChainSeries" );
DeclareGlobalFunction( "ExponentsOfPcElementPermGroup" );
DeclareGlobalFunction( "PermpcgsPcGroupPcgs" );
DeclareGlobalFunction( "SolvableNormalClosurePermGroup" );
DeclareGlobalFunction( "TailOfPcgsPermGroup" );
DeclareGlobalFunction( "PcgsMemberPcSeriesPermGroup" );
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#E pcgsperm.gd
##
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