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<div class="ChapSects"><a href="chap1.html#X7DFB63A97E67C0A1">1 <span class="Heading">
Introduction
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<h3>1 <span class="Heading">
Introduction
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<p>The aim of this package is to turn <strong class="pkg"> GAP </strong> more user-friendly, at least for semigroup theorists. It requires the usage of external programs as is the case of <code class="code">graphviz</code> <a href="chapBib.html#biBKoutsofiosNorth:2002">[DEGKNW02]</a>, a software for drawing graphs developed at AT & T Labs, that can be obtained at <span class="URL"><a href="http://www.graphviz.org/">http://www.graphviz.org/</a></span>. It is used not only to draw right Cayley graphs of finite semigroups and Sch{\"u}zenberger graphs of finite inverse semigroups but also to visualize in the usual way the egg-box picture of a D-classe of a finite semigroup. <br><br> <strong class="button">Important note</strong>: The version of <code class="code">graphviz</code> to install should be greater or equal to 1.16. <br><br> Tcl/Tk should also be available in order to run the graphical interfaces (XAutomaton and XSemigroup) used to specify automata and semigroups.</p>
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