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<h1>HomalgToCAS</h1>


<h2>A window to the outer world</h2>

<p>
    2025.08-01</p>

<p>
    6 September 2025
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<p><b>
    Thomas Bächler




  </b>
<br />Email: <span class="URL"><a href="mailto:thomas@momo.math.rwth-aachen.de">thomas@momo.math.rwth-aachen.de</a></span>
<br />Homepage: <span class="URL"><a href="http://wwwb.math.rwth-aachen.de/~thomas/">http://wwwb.math.rwth-aachen.de/~thomas/</a></span>
<br />Address: <br />Thomas Bächler<br /> Lehrstuhl B fuer Mathematik, RWTH Aachen<br /> Templergraben 64<br /> 52062 Aachen<br /> Germany<br />
</p><p><b>
    Mohamed Barakat




  </b>
<br />Email: <span class="URL"><a href="mailto:mohamed.barakat@uni-siegen.de">mohamed.barakat@uni-siegen.de</a></span>
<br />Homepage: <span class="URL"><a href="https://mohamed-barakat.github.io">https://mohamed-barakat.github.io</a></span>
<br />Address: <br />Walter-Flex-Str. 3<br /> 57072 Siegen<br /> Germany<br />
</p><p><b>
    Simon Görtzen




  </b>
<br />Email: <span class="URL"><a href="mailto:simon.goertzen@rwth-aachen.de">simon.goertzen@rwth-aachen.de</a></span>
<br />Homepage: <span class="URL"><a href="https://www.linkedin.com/in/simongoertzen/">https://www.linkedin.com/in/simongoertzen/</a></span>
<br />Address: <br />Simon Görtzen<br /> Lehrstuhl B fuer Mathematik, RWTH Aachen<br /> Templergraben 64<br /> 52062 Aachen<br /> Germany<br />
</p><p><b>
    Sebastian Gutsche




  </b>
<br />Email: <span class="URL"><a href="mailto:gutsche@mathematik.uni-siegen.de">gutsche@mathematik.uni-siegen.de</a></span>
<br />Homepage: <span class="URL"><a href="https://sebasguts.github.io">https://sebasguts.github.io</a></span>
<br />Address: <br />Department Mathematik<br /> Universität Siegen<br /> Walter-Flex-Straße 3<br /> 57072 Siegen<br /> Germany<br />
</p><p><b>
    Vinay Wagh




  </b>
<br />Email: <span class="URL"><a href="mailto:waghoba@gmail.com">waghoba@gmail.com</a></span>
<br />Homepage: <span class="URL"><a href="http://www.iitg.ernet.in/vinay.wagh/">http://www.iitg.ernet.in/vinay.wagh/</a></span>
<br />Address: <br />E-102, Department of Mathematics,<br /> Indian Institute of Technology Guwahati,<br /> Guwahati, Assam, India.<br /> PIN: 781 039.<br /> India<br />
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<h3>Copyright</h3>
<p>© 2007-2015 by Mohamed Barakat, Thomas Breuer, Simon Görtzen, and Frank Lübeck. This package may be distributed under the terms and conditions of the GNU Public License Version 2 or (at your option) any later version.</p>

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<h3>Acknowledgements</h3>
<p>We are very much indebted to Max Neunhöffer who provided the first piece of code around which the package <strong class="pkg">IO_ForHomalg</strong> was built. The package <strong class="pkg">HomalgToCAS</strong> provides a further abstraction layer preparing the communication.</p>

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<h3>Contents<a id="contents" name="contents"></a></h3>

<div class="ContChap"><a href="chap1.html#X7DFB63A97E67C0A1">1 <span class="Heading">Introduction</span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap1.html#X82F5B96B817F7863">1.1 <span class="Heading"><strong class="pkg">HomalgToCAS</strong> provides ...</span></a>
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<div class="ContChap"><a href="chap2.html#X85268DEB879735D2">2 <span class="Heading">Installation of the <strong class="pkg">HomalgToCAS</strong> Package</span></a>
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<div class="ContChap"><a href="chap3.html#X83F828CA834F6529">3 <span class="Heading">Watch and Influence the Communication</span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap3.html#X86FA580F8055B274">3.1 <span class="Heading">Functions</span></a>
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<div class="ContSSBlock">
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap3.html#X798522BD7B01027E">3.1-1 homalgIOMode</a></span>
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<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap3.html#X803B49FB7BB6A060">3.2 <span class="Heading">The Pictograms</span></a>
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<span class="ContSS"><br /><span class="nocss">  </span><a href="chap3.html#X862CF3DF79482869">3.2-1 HOMALG_IO.Pictograms</a></span>
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<div class="ContChap"><a href="chap4.html#X82A8947087082312">4 <span class="Heading">External Rings</span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap4.html#X85D85B6C837F4B05">4.1 <span class="Heading">External Rings: Representation</span></a>
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<span class="ContSS"><br /><span class="nocss">  </span><a href="chap4.html#X7D2FB57D87A6B71A">4.1-1 IsHomalgExternalRingRep</a></span>
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<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap4.html#X7C7962B97E6CDFE2">4.2 <span class="Heading">Rings: Constructors</span></a>
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<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap4.html#X7B1D4BD485F406CA">4.3 <span class="Heading">External Rings: Operations and Functions</span></a>
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<div class="ContChap"><a href="chapA.html#X84555A0687FBAE33">A <span class="Heading">Overview of the <strong class="pkg">homalg</strong> Package Source Code</span></a>
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<div class="ContChap"><a href="chapBib.html"><span class="Heading">References</span></a></div>
<div class="ContChap"><a href="chapInd.html"><span class="Heading">Index</span></a></div>
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