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<b>let </b><font color="Maroon">A</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">Y</font> be    <a href="hidden.html#M1">set</a> ;<br/>



<b>assume </b><a NAME="E1:1"/>
<font color="Maroon">A</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">Y</font>
 ;<br/>

<b>hence </b> <a href="relat_1.html#K6">id</a> <font color="Maroon">A</font> = 
 <a href="relat_1.html#K6">id</a> <span class="p1">(<span class="default"><font color="Maroon">Y</font> <a href="xboole_0.html#K3">/\</a> <font color="Maroon">A</font></span>)</span>
<b>by </b><i><a class="ref" href="xboole_1.html#T28">XBOOLE_1:28</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="relat_1.html#K6">id</a> <font color="Maroon">Y</font></span>)</span> <a href="funct_1.html#NK3" target="_self">*</a> <span class="p1">(<span class="default"><a href="relat_1.html#K6">id</a> <font color="Maroon">A</font></span>)</span>
<b>by </b><i><a class="ref" href="funct_1.html#T43">FUNCT_1:43</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="relat_1.html#K6">id</a> <font color="Maroon">Y</font></span>)</span> <a href="relat_1.html#K7">|</a> <font color="Maroon">A</font>
<b>by </b><i><a class="ref" href="relat_1.html#T94">RELAT_1:94</a></i>
;<br/><br/>


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