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<b>let </b><font color="Maroon">p</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="cqc_lang.html#K7">CQC-WFF</a> ;<br/><b>let </b><font color="Maroon">q</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="cqc_lang.html#K7">CQC-WFF</a> ;<br/>



<b>assume </b><a NAME="E1:46"/>
<font color="Maroon">p</font> <a href="cqc_lang.html#K12">=&gt;</a> <font color="Maroon">q</font> is <a href="cqc_the1.html#V2">valid</a>
 ;<br/>

<a NAME="E2:46"/><b>then </b><i><font color="Green">E39</font></i>: 
<span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">p</font></span><a href="domain_1.html#K6">}</a></span> <a href="cqc_the1.html#R3">|-</a> <font color="Maroon">p</font> <a href="cqc_lang.html#K12">=&gt;</a> <font color="Maroon">q</font>
 
<b>by </b><i><a class="ref" href="cqc_the1.html#T98">CQC_THE1:98</a></i>;<br/>
<a NAME="E3:46"/>
<span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">p</font></span><a href="domain_1.html#K6">}</a></span> <a href="cqc_the1.html#R3">|-</a> <font color="Maroon">p</font>
 
<b>by </b><i><a class="ref" href="cqc_the2.html#T91">CQC_THE2:91</a></i>;<br/>
<a NAME="E4:46"/><b>then </b>
<span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">p</font></span><a href="domain_1.html#K6">}</a></span> <a href="cqc_the1.html#R3">|-</a> <font color="Maroon">q</font>
 
<b>by </b><i><a class="txt" href="cqc_the3.html#E2:46"><i><font color="Green">E39</font></i></a>, <a class="ref" href="cqc_the1.html#T92">CQC_THE1:92</a></i>;<br/>
<b>hence </b><a NAME="E5:46"/>
<font color="Maroon">p</font> <a href="cqc_the3.html#R1" target="_self">|-</a> <font color="Maroon">q</font>
 <b>by </b><i/>;<br/>


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