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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>suppose</title><link rel="stylesheet" type="text/css" href="docbook.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="Matita V0.5.9 User Manual (rev. 0.5.9 )" /><link rel="up" href="sec_declarative_tactics.html" title="Chapter 8. Declarative Tactics" /><link rel="prev" href="tac_obtain.html" title="obtain" /><link rel="next" href="tac_thesisbecomes.html" title="the thesis becomes" /></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">suppose</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="tac_obtain.html">Prev</a> </td><th width="60%" align="center">Chapter 8. Declarative Tactics</th><td width="20%" align="right"> <a accesskey="n" href="tac_thesisbecomes.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_suppose"></a>suppose</h2></div></div></div><p><strong class="userinput"><code>suppose t1 (x) that is equivalent to t2</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>suppose</strong></span> <span class="emphasis"><em><a class="link" href="sec_terms.html#grammar.term">term</a></em></span> <span class="bold"><strong> (</strong></span> <span class="emphasis"><em><a class="link" href="sec_terms.html#grammar.id">id</a></em></span>
   4              <span class="bold"><strong>) </strong></span> [ <span class="bold"><strong>that is equivalent to</strong></span>  <span class="emphasis"><em><a class="link" href="sec_terms.html#grammar.term">term</a></em></span> ]</p></dd><dt><span class="term">Pre-condition:</span></dt><dd><p>The conclusion of the current proof must be
   5            <span class="command"><strong>∀x:T.P</strong></span> or
   6            <span class="command"><strong>T→P</strong></span> where <span class="command"><strong>T</strong></span> is
   7            a proposition (i.e. <span class="command"><strong>T</strong></span> has type
   8            <span class="command"><strong>Prop</strong></span> or <span class="command"><strong>CProp</strong></span>).</p></dd><dt><span class="term">Action:</span></dt><dd><p>It adds to the context of the current sequent to prove a new
   9            declaration <span class="command"><strong>x : T </strong></span>. The new conclusion becomes
  10            <span class="command"><strong>P</strong></span>.</p></dd><dt><span class="term">New sequents to prove:</span></dt><dd><p>None.</p></dd></dl></div><p>
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