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<b>consider </b><font color="Maroon">A</font> being    <a href="hidden.html#M1">set</a> <b> such that </b><br/><a NAME="E2:45_1_1"/><i><font color="Green">E37</font></i>: 
(  <a href="catalg_1.html#K3" target="_self">CatSign</a> <font color="Maroon">A</font> is    <a href="instalg1.html#M1">Subsignature</a> of <font color="Maroon">S</font> &amp; the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">S</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2"><a href="tarski.html#K1">{</a><span class="default">0</span><a href="tarski.html#K1">}</a></span>,<span class="p2">(<span class="default">2 <a href="finseq_2.html#K4">-tuples_on</a> <font color="Maroon">A</font></span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span> )
 <b>by </b><i/>;<br/>
<a NAME="E3:45_1_1"/>
<font color="Maroon">s</font> <a href="mcart_1.html#K2">`2</a>  <a href="hidden.html#R2">in</a> 2 <a href="finseq_2.html#K4">-tuples_on</a> <font color="Maroon">A</font>
 
<b>by </b><i>, <a class="ref" href="mcart_1.html#T10">MCART_1:10</a></i>;<br/>
<a NAME="E4:45_1_1"/><b>then </b>
 ex <font color="Olive">a</font>, <font color="Olive">b</font> being   <a href="hidden.html#M1">set</a>  st <br/>( <font color="Olive">a</font> <a href="hidden.html#R2">in</a> <font color="Maroon">A</font> &amp; <font color="Olive">b</font> <a href="hidden.html#R2">in</a> <font color="Maroon">A</font> &amp; <font color="Maroon">s</font> <a href="mcart_1.html#K2">`2</a>  <a href="hidden.html#R1">=</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Olive">a</font>,<font color="Olive">b</font></span><a href="finseq_1.html#K10">*&gt;</a></span> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E5:45_1_1"/>
( <font color="Maroon">s</font> <a href="mcart_1.html#K2">`2</a>  is <a href="relat_1.html#V1">Relation-like</a> &amp; <font color="Maroon">s</font> <a href="mcart_1.html#K2">`2</a>  is <a href="funct_1.html#V1">Function-like</a> )
 ;<br/>


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