<p><span class="URL"><a href="https://gap-packages.github.io/sgpviz/">SgpViz</a></span> package is free software; you can redistribute it and/or modify it under the terms of the <span class="URL"><a href="https://www.fsf.org/licenses/gpl.html">GNU General Public License</a></span> as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. For details, see the file 'GPL' included in the package or see the FSF's own site.</p>
<p><a id="X82A988D47DFAFCFA" name="X82A988D47DFAFCFA"></a></p>
<h3>Acknowledgements</h3>
<p>The first author acknowledges financial support of FCT, through the <em>Centro de Matemática da Universidade do Porto</em>.</p>
<p>The second author acknowledges financial support of FCT and the POCTI program through a scholarship given by <em>Centro de Matemática da Universidade do Porto</em>.</p>
<p>Both authors acknowledge Jorge Almeida, Vítor H. Fernandes and Pedro Silva for many helpful discussions and comments.</p>
<p>The maintainer wants to acknowledge partial support by:</p>
<p>FCT - Fundação para a Ciência e a Tecnologia under the project PTDC/MAT/65481/2006</p>
<p><em>Centro de Matemática da Universidade do Porto</em> (CMUP), funded by the European Regional Development Fund through the programme COMPETE and by the Portuguese Government through the FCT project PEst-C/MAT/UI0144/2011.</p>
<p>CMUP (UID/MAT/00144/2013 and UID/MAT/00144/2019), which is funded by FCT (Portugal) with national (MEC) and European structural funds through the programs FEDER, under the partnership agreement PT2020.</p>
<p>Furthermore, the maintainer wants to thank the organisers of <code class="code">GAPDays</code> in their several editions, as well as several people (for advises, giving feedback, etc). Among them I would like to refer: Max Horn, James Mitchel, Jan Philipp Wächter, João Araújo, Alfredo Costa and Teresa Melo.</p>
<p><a id="X7982162280BC7A61" name="X7982162280BC7A61"></a></p>
<h3>Colophon</h3>
<p>This manual describes the <strong class="pkg">GAP</strong> package <span class="URL"><a href="https://gap-packages.github.io/sgpviz/">SgpViz</a></span>, Version 0.999.6, for visualising finite semigroups.</p>
<p>Since Version 0.998 (released in 2008), the package is maintained by the first author.</p>
<p>The present package is superseded by the <strong class="pkg">GAP</strong> package <em>semigroups</em>, by James Mitchel, in what concerns some aspects of semigroup visualisation. We strongly recommend the usage of that package, unless you find useful specific tools available in <span class="URL"><a href="https://gap-packages.github.io/sgpviz/">SgpViz</a></span> but not in <em>semigroups</em>.</p>
<p>Bug reports, suggestions and comments are, of course, welcome. Please use the email address <span class="URL"><a href="mailto:mdelgado@fc.up.pt">mdelgado@fc.up.pt</a></span> to this effect.</p>
<p>If you have benefited from the use of the <span class="URL"><a href="https://gap-packages.github.io/sgpviz/">SgpViz</a></span> <strong class="pkg">GAP</strong> package in your research, please cite it in addition to <strong class="pkg">GAP</strong> itself, following the scheme proposed in <span class="URL"><a href="https://www.gap-system.org/Contacts/cite.html">https://www.gap-system.org/Contacts/cite.html</a></span>.</p>
