Fellow GAP Forum members,
I want to thank Franz Gähler and Derek Holt for their help with my problem
of calculating the cohomology of a crystal.
I am, sadly, still having a problem...and I am not sure what it is. This is
now more of a troubleshooting problem, so I'm not sure if this is the proper
place to ask.

When I enter the following, from Dr. Gähler,
    gap> g:=Group([[-1,0,0],[0,-1,0],[0,0,-1]],[[-1,0,0],[0,1,0],[0,0,-1]]);
    Group([ [ [ -1, 0, 0 ], [ 0, -1, 0 ], [ 0, 0, -1 ] ],
      [ [ -1, 0, 0 ], [ 0, 1, 0 ], [ 0, 0, -1 ] ] ])
     gap> gens := GeneratorsOfGroup(G);
     [ [ [ -1, 0, 0 ], [ 0, -1, 0 ], [ 0, 0, -1 ] ],
       [ [ -1, 0, 0 ], [ 0, 1, 0 ], [ 0, 0, -1 ] ] ]
     gap> F := Image( IsomorphismFpGroupByGenerators( G, gens ) );
Instead of
     <fp group of size 4 on the generators [ F1, F2 ]>
as should be the case, I get an error message:
    Error the coset enumeration has defined more than 256000 cosets:
    type 'return;' if you want to continue with a new limit of 512000
cosets,
    type 'quit;' if you want to quit the coset enumeration,
    type 'maxlimit := 0; return;' in order to continue without a limit,
     at
    Error( "the coset enumeration has defined more ", "than ", limit,
     " cosets:\ntype 'return;' ", "if you want to continue with a new limit
",
     "of ", maxlimit, " cosets,\ntype 'quit;' ", "if you want to quit the
coset "
      , "enumeration,\ntype 'maxlimit := 0; return;'",
     " in order to continue without a limit,\n" );
    TCENUM.CosetTableFromGensAndRels( fgens, grels, fsgens ) called from
    CosetTableFromGensAndRels( fgens, grels, fsgens ) called from
    TryCosetTableInWholeGroup( H ) called from
    CosetTableInWholeGroup( U ) called from
    One( G ) called from
    ...

Am I doing something wrong? I am using GAP 4r2 on Windows NT Workstation 4.0
SP6.

Thank you all for any assistance.

John Huesman

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