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<div class="ChapSects"><a href="chap1_mj.html#X7DFB63A97E67C0A1">1 <span class="Heading">Introduction</span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap1_mj.html#X86C437C47F3988E8">1.1 <span class="Heading">Installation and Loading</span></a>
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<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap1_mj.html#X83499FE181F08DC9">1.2 <span class="Heading">For Further Information</span></a>
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<h3>1 <span class="Heading">Introduction</span></h3>

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<h4>1.1 <span class="Heading">Installation and Loading</span></h4>

<p>Like other <strong class="pkg">GAP</strong> packages, you download and unpack this package into <strong class="pkg">GAP</strong>'s pkg directory. For example, if you were running GAP on some machine with a Unix-based operating system and GAP were installed in the directory /usr/local/gap then you would do the following to install CRIME.




<div class="example"><pre>
$ cd /usr/local/gap/pkg
$ su
% wget https://github.com/gap-packages/crime/releases/download/v1.5/crime-1.6.tar.gz
% tar xvzf crime-1.6.tar.gz

</pre></div>

<p>In this situation, users would load the package with the <code class="keyw">LoadPackage</code> command.</p>


<div class="example"><pre>
$ gap
<span class="GAPprompt">gap></span> <span class="GAPinput">LoadPackage("crime");</span>

</pre></div>

<p>Users not having root access, using someone else's computer, or having bad relationships with their network administrators, could install the package into their home directories or into some other writable directory such as /tmp and load the package as follows.




<div class="example"><pre>
$ mkdir /tmp/pkg
$ cd /tmp/pkg
% wget https://github.com/gap-packages/crime/releases/download/v1.5/crime-1.6.tar.gz
$ tar xvzf crime-1.6.tar.gz
$ gap -l ';/tmp'
<span class="GAPprompt">gap></span> <span class="GAPinput">LoadPackage("crime");</span>
</pre></div>

<p>Even simpler, users can simply install the package in the <code class="keyw">~/.gap</code> directory as follows.</p>


<div class="example"><pre>
$ mkdir -p ~/.gap/pkg
$ cd ~/.gap/pkg
% wget https://github.com/gap-packages/crime/releases/download/v1.5/crime-1.6.tar.gz
% tar xvzf crime-1.6.tar.gz
$ gap
<span class="GAPprompt">gap></span> <span class="GAPinput">LoadPackage("crime");</span>
</pre></div>

<p>Finally, it would be a good idea to run the test file to confirm that all the functions work properly. This can be accomplished as follows.</p>


<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">ReadPackage("crime", "tst/testall.g");</span>
</pre></div>

<p>You can count yourself lucky if <strong class="pkg">GAP</strong> doesn't complain about anything. There is also a longer running test file for those having ample free time described in Appendix B.



<p><a id="X83499FE181F08DC9" name="X83499FE181F08DC9"></a></p>

<h4>1.2 <span class="Heading">For Further Information</span></h4>

<p>The file <code class="keyw">doc/example.*</code> contains the step-by-step <strong class="pkg">CRIME</strong> calculation of the cohomology ring of the quaternion group. The file <code class="keyw">doc/explanation.*</code> contains a theoretical description of how the package calculates the various cohomology products. Users wishing to read the source code can print all the programs in the <code class="keyw">gap</code> directory with the program <code class="keyw">gap/print.pl</code> which should be executed in the <code class="keyw">gap</code> directory.</p>


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