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<a NAME="E1:42_1_1"/>
(  <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><a href="funct_6.html#K7">Frege</a> <font color="Maroon">u</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="card_3.html#K4">product</a> <span class="p1">(<span class="default"><a href="funct_6.html#K2">doms</a> <font color="Maroon">u</font></span>)</span> &amp;  <a href="funct_6.html#K2">doms</a> <font color="Maroon">u</font> <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> &amp;  <a href="card_3.html#K4">product</a> <span class="p1">(<span class="default"><a href="funct_6.html#K3">rngs</a> <font color="Maroon">u</font></span>)</span> <a href="tarski.html#R1">c=</a>  <a href="card_3.html#K4">product</a> <font color="Maroon">a</font> &amp;  <a href="relat_1.html#K2">rng</a> <span class="p1">(<span class="default"><a href="funct_6.html#K7">Frege</a> <font color="Maroon">u</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="card_3.html#K4">product</a> <span class="p1">(<span class="default"><a href="funct_6.html#K3">rngs</a> <font color="Maroon">u</font></span>)</span> )
 
<b>by </b><i><a class="txt" href="prvect_1.html#E5"><i><font color="Green">Lemma23</font></i></a>, <a class="ref" href="funct_6.html#T58">FUNCT_6:58</a>, <a class="ref" href="funct_6.html#D7">FUNCT_6:def 7</a></i>;<br/>
<b>hence </b><a NAME="E2:42_1_1"/>
 <a href="funct_6.html#K7">Frege</a> <font color="Maroon">u</font> is   <a href="binop_1.html#NM1">UnOp</a> of  <a href="card_3.html#K4">product</a> <font color="Maroon">a</font>
 <b>by </b><i><a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a>, <a class="ref" href="relset_1.html#T11">RELSET_1:11</a></i>;<br/>


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