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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>Redex: Practical Semantics Engineering</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,&quot;tocview_0&quot;);">&#9660;</a></td><td></td><td><a href="" class="tocviewselflink" data-pltdoc="x">Redex:<span class="mywbr"> &nbsp;</span> Practical Semantics Engineering</a></td></tr></table></div><div class="tocviewsublistonly" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1&nbsp;</td><td><a href="tutorial.html" class="tocviewlink" data-pltdoc="x">Amb:<span class="mywbr"> &nbsp;</span> A Redex Tutorial</a></td></tr><tr><td align="right">2&nbsp;</td><td><a href="The_Redex_Reference.html" class="tocviewlink" data-pltdoc="x">The Redex Reference</a></td></tr><tr><td align="right">3&nbsp;</td><td><a href="benchmark.html" class="tocviewlink" data-pltdoc="x">Automated Testing Benchmark</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><span class="tocsublinknumber"></span><a href="#%28part._top%29" class="tocsubseclink" data-pltdoc="x">Redex:<span class="mywbr"> &nbsp;</span> Practical Semantics Engineering</a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">6.1</span></div><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, &quot;6.1&quot;, &quot;../&quot;);" onfocus="this.style.color=&quot;black&quot;; this.style.textAlign=&quot;left&quot;; if (this.value == &quot;...search manuals...&quot;) this.value=&quot;&quot;;" onblur="if (this.value.match(/^ *$/)) { this.style.color=&quot;#888&quot;; this.style.textAlign=&quot;center&quot;; this.value=&quot;...search manuals...&quot;; }"/></form>&nbsp;&nbsp;<a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot(&quot;6.1&quot;);">top</a></span><span class="navright">&nbsp;&nbsp;<span class="nonavigation">&larr; prev</span>&nbsp;&nbsp;<a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot(&quot;6.1&quot;);">up</a>&nbsp;&nbsp;<a href="tutorial.html" title="forward to &quot;1 Amb: A Redex Tutorial&quot;" data-pltdoc="x">next &rarr;</a></span>&nbsp;</div><h2 x-source-module="(lib &quot;redex/redex.scrbl&quot;)" x-part-tag="&quot;top&quot;"><a name="(part._top)"></a><a name="(part._.Redex__.Practical_.Semantics_.Engineering)"></a>Redex: Practical Semantics Engineering</h2><div class="SAuthorListBox"><span class="SAuthorList"><p class="author">Robert Bruce Findler<br/>and Casey Klein</p></span></div><p>PLT Redex consists of a domain-specific language for specifying
reduction semantics, plus a suite of tools for working with the
semantics.</p><p>This manual consists of two parts: a tutorial introduction and a reference for Redex.
Also see
<a href="http://redex.racket-lang.org/"><span class="stt">http://redex.racket-lang.org/</span></a>
and the <span class="stt">examples</span> subdirectory in the <span class="stt">redex</span> collection.</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="tutorial.html" class="toptoclink" data-pltdoc="x">1<span class="hspace">&nbsp;</span>Amb: A Redex Tutorial</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="tutorial.html#%28part._.Defining_a_.Language%29" class="toclink" data-pltdoc="x">1.1<span class="hspace">&nbsp;</span>Defining a Language</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="tutorial.html#%28part._.Typing%29" class="toclink" data-pltdoc="x">1.2<span class="hspace">&nbsp;</span>Typing</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="tutorial.html#%28part._.Testing_.Typing%29" class="toclink" data-pltdoc="x">1.3<span class="hspace">&nbsp;</span>Testing Typing</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="tutorial.html#%28part._.Defining_a_.Reduction_.Relation%29" class="toclink" data-pltdoc="x">1.4<span class="hspace">&nbsp;</span>Defining a Reduction Relation</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="tutorial.html#%28part._.Testing_.Reduction_.Relations%29" class="toclink" data-pltdoc="x">1.5<span class="hspace">&nbsp;</span>Testing Reduction Relations</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="tutorial.html#%28part._.Random_.Testing%29" class="toclink" data-pltdoc="x">1.6<span class="hspace">&nbsp;</span>Random Testing</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="tutorial.html#%28part._.Typesetting_the_.Reduction_.Relation%29" class="toclink" data-pltdoc="x">1.7<span class="hspace">&nbsp;</span>Typesetting the Reduction Relation</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="tutorial.html#%28part._doc-bibliography%29" class="toclink" data-pltdoc="x">Bibliography</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html" class="toptoclink" data-pltdoc="x">2<span class="hspace">&nbsp;</span>The Redex Reference</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._.Patterns%29" class="toclink" data-pltdoc="x">2.1<span class="hspace">&nbsp;</span>Patterns</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._.Terms%29" class="toclink" data-pltdoc="x">2.2<span class="hspace">&nbsp;</span>Terms</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._.Languages%29" class="toclink" data-pltdoc="x">2.3<span class="hspace">&nbsp;</span>Languages</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._.Reduction_.Relations%29" class="toclink" data-pltdoc="x">2.4<span class="hspace">&nbsp;</span>Reduction Relations</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._.Other_.Relations%29" class="toclink" data-pltdoc="x">2.5<span class="hspace">&nbsp;</span>Other Relations</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._.Testing%29" class="toclink" data-pltdoc="x">2.6<span class="hspace">&nbsp;</span>Testing</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._.G.U.I%29" class="toclink" data-pltdoc="x">2.7<span class="hspace">&nbsp;</span>GUI</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._.Typesetting%29" class="toclink" data-pltdoc="x">2.8<span class="hspace">&nbsp;</span>Typesetting</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._.Picts__.P.D.F____.Post.Script%29" class="toclink" data-pltdoc="x">2.8.1<span class="hspace">&nbsp;</span>Picts, PDF, &amp; PostScript</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._.Customization%29" class="toclink" data-pltdoc="x">2.8.2<span class="hspace">&nbsp;</span>Customization</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._pink%29" class="toclink" data-pltdoc="x">2.8.3<span class="hspace">&nbsp;</span>Removing the Pink Background</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._.L.Ws%29" class="toclink" data-pltdoc="x">2.8.4<span class="hspace">&nbsp;</span>LWs</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="The_Redex_Reference.html#%28part._.Macros_and_.Typesetting%29" class="toclink" data-pltdoc="x">2.9<span class="hspace">&nbsp;</span>Macros and Typesetting</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="benchmark.html" class="toptoclink" data-pltdoc="x">3<span class="hspace">&nbsp;</span>Automated Testing Benchmark</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="benchmark.html#%28part._manage%29" class="toclink" data-pltdoc="x">3.1<span class="hspace">&nbsp;</span>Managing Benchmark Modules</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="benchmark.html#%28part._run%29" class="toclink" data-pltdoc="x">3.2<span class="hspace">&nbsp;</span>Running Benchmark Models</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="benchmark.html#%28part._log%29" class="toclink" data-pltdoc="x">3.3<span class="hspace">&nbsp;</span>Logging</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="benchmark.html#%28part._.Plotting%29" class="toclink" data-pltdoc="x">3.4<span class="hspace">&nbsp;</span>Plotting</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="benchmark.html#%28part._.Benchmark_.Models%29" class="toclink" data-pltdoc="x">3.5<span class="hspace">&nbsp;</span>Benchmark Models</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="doc-index.html" class="toptoclink" data-pltdoc="x">Index</a></p></td></tr></table><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, &quot;6.1&quot;, &quot;../&quot;);" onfocus="this.style.color=&quot;black&quot;; 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