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<b>let </b><font color="Maroon">R</font> be   <a href="relat_1.html#NM1">Relation</a>, <font color="Maroon">Q</font> be   <a href="relat_1.html#NM1">Relation</a>;<br/>

<b>assume </b><a NAME="E1:31"/><i><font color="Green">E21</font></i>: 
<font color="Maroon">R</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">Q</font>
 ;<br/>

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

<b>given </b><font color="Maroon">p</font> being    <a href="rewrite1.html#M1" target="_self">RedSequence</a> of <font color="Maroon">R</font><b> such that </b><a NAME="E2:31"/><i><font color="Green">E29</font></i>: 
( <font color="Maroon">p</font> <a href="funct_1.html#K1">.</a> 1 <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> &amp; <font color="Maroon">p</font> <a href="funct_1.html#K1">.</a> <span class="p1">(<span class="default"><a href="finseq_1.html#K3">len</a> <font color="Maroon">p</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">b</font> )
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="rewrite1.html#D3" target="_self">REWRITE1:def 3</a><br/>

<a NAME="E3:31"/>
<font color="Maroon">p</font> is    <a href="rewrite1.html#M1" target="_self">RedSequence</a> of <font color="Maroon">Q</font>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E4:31"/>
 ex <font color="Olive">p</font> being   <a href="rewrite1.html#M1" target="_self">RedSequence</a> of <font color="Maroon">Q</font> st <br/>( <font color="Olive">p</font> <a href="funct_1.html#K1">.</a> 1 <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> &amp; <font color="Olive">p</font> <a href="funct_1.html#K1">.</a> <span class="p1">(<span class="default"><a href="finseq_1.html#K3">len</a> <font color="Olive">p</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">b</font> )
 <b>by </b><i><a class="ref" href="rewrite1.html#T2" target="_self">Th2</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="rewrite1.html#D3" target="_self">REWRITE1:def 3</a><br/>


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