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<html><head><title>[xgap] 2.4 Historical Remarks and Acknowledgements</title></head>
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<h1>2.4 Historical Remarks and Acknowledgements</h1><p>
<p>
A first program for drawing a diagram showing the lattice of subgroups
of  a finite  group  that  had  been   calculated by  a  computer  was
implemented by H. J&uuml;rgensen in 1965 (see <a href="biblio.htm#FJ65"><cite>FJ65</cite></a>).
<p>
The  design of XGAP was strongly  influenced and  in fact triggered by
the  QUOTPIC system of  Derek Holt  and  Sarah Rees (see <a href="biblio.htm#HR91"><cite>HR91</cite></a>)
which allows to depict graphically knowledge about normal subgroups of
a finitely presented group found by a variety of methods for the
investigation of finitely presented groups.  It seemed most desirable
to allow to depict in a similar way the even wider variety of
information on subgroups of groups that can be obtained by a system
such as <font face="Gill Sans,Helvetica,Arial">GAP</font>.
<p>
Beginning 1993,  Frank Celler developed the  idea of an interface from
<font face="Gill Sans,Helvetica,Arial">GAP</font>   to graphic systems that  allowed  to actually write commands for
graphical   tasks  in  the <font face="Gill Sans,Helvetica,Arial">GAP</font>  language   and  together with  Susanne
Keitemeier  (see <a href="biblio.htm#SK95"><cite>SK95</cite></a>) wrote a first version
of   programs in XGAP  for   drawing diagrams  representing posets  of
subgroups of finite and finitely presented groups.  We most gratefully
acknowledge  the  help of  Sarah Rees in  implementing the interactive
lattice functions and in beta testing the <font face="Gill Sans,Helvetica,Arial">GAP</font>3 version of XGAP.
<p>
In 1998, Thomas Breuer, Frank Celler, Joachim Neub&uuml;ser and Max
Neunh&ouml;ffer planned the new concepts for the <font face="Gill Sans,Helvetica,Arial">GAP</font>4
version. The implementation and portation to <font face="Gill Sans,Helvetica,Arial">GAP</font>4 was done mainly by Max
Neunh&ouml;ffer in 1998 and 1999. Michael Ringe added the link to his
MeatAxe programs. We like to thank all those who have adapted the <font face="Gill Sans,Helvetica,Arial">GAP</font> 
library to the needs of the new XGAP, in particular Alexander Hulpke who 
has been extremely helpful with this task.
<p>
<p>
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<address>xgap manual<br>Mai 2003
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