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   2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>intro_clear</title><link rel="stylesheet" type="text/css" href="docbook.css" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="home" href="index.html" title="Matita V0.99.5 User Manual (rev. 0.99.5 )" /><link rel="up" href="sec_tactics.html" title="Chapter 7. Tactics" /><link rel="prev" href="tac_intro.html" title="intro" /><link rel="next" href="macro_intro.html" title="macro_input" /></head><body><a xmlns="" href="../../../"><div class="matita_logo"><img src="figures/matita.png" alt="Tiny Matita logo" /><span>Matita Home</span></div></a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">intro_clear</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="tac_intro.html">Prev</a> </td><th width="60%" align="center">Chapter 7. Tactics</th><td width="20%" align="right"> <a accesskey="n" href="macro_intro.html">Next</a></td></tr></table><hr /></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="tac_intro_clear"></a>intro_clear</h2></div></div></div><p><strong class="userinput"><code>#_</code></strong></p><p>
   3       </p><div class="variablelist"><dl class="variablelist"><dt><span class="term">Synopsis:</span></dt><dd><p><span class="bold"><strong>#_</strong></span></p></dd><dt><span class="term">Pre-conditions:</span></dt><dd><p>The conclusion of the sequent to prove must be an implication.
   4             </p></dd><dt><span class="term">Action:</span></dt><dd><p>It applies the ``a fortiori'' rule for implication,
   5              closing the current sequent.</p></dd><dt><span class="term">New sequents to prove:</span></dt><dd><p>It opens a new sequent whose conclusion is the conclusion
   6              of the implication of the original sequent.</p></dd></dl></div><p>
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