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<html><head><title>[xgap] 5.1 GraphicSubgroupLattice</title></head>
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<h1>5.1 GraphicSubgroupLattice</h1><p>
<p>
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<li><code>GraphicSubgroupLattice( </code><var>g</var><code> )</code>
<p>
<code>GraphicSubgroupLattice</code> creates a new graphic sheet for the Hasse
diagram of the subgroup lattice of <var>g</var>.  The next sections describe
how to select and move vertices and the following sections describe the
available menus.
<p>
<pre>
gap&gt; GraphicSubgroupLattice( DihedralGroup(8) );
&lt;graphic subgroup lattice "GraphicSubgroupLattice"&gt;
</pre>
<p>
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<li><code>GraphicSubgroupLattice( </code><var>g</var><code>, </code><var>width</var><code>, </code><var>height</var><code> )</code>
<p>
In this form <code>GraphicSubgroupLattice</code> creates a graphic sheet of initial
dimensions <var>width</var> times <var>height</var>.  However it is still possible to change
these dimensions later using either the menu (described in
<a href="C005S008.htm">GraphicSubgroupLattice, Poset Menu</a>) or the operation <code>Resize</code> for graphic 
sheets (see <a href="C006S001.htm#SSEC14">Resize</a>).
<p>
This function is the same for all types of groups. It only behaves differently
according to some properties of the group. For example finitely presented
groups are treated differently because other algorithms apply in this case
and some of the standard ones are not feasible to be carried out. 
<p>
In contrast to the <font face="Gill Sans,Helvetica,Arial">GAP</font>3 version of XGAP all graphic subgroup lattices 
are interactive so you can always remove vertices. For a finite group you 
can still get the full lattice by choosing <code>All Subgroups</code> for the whole 
group.
<p>
<p>
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<address>xgap manual<br>Mai 2003
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