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<b>let </b><font color="Maroon">X1</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">X2</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">Y1</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">Y2</font> be    <a href="hidden.html#M1">set</a> ;<br/>







<b>assume </b><a NAME="E1:88"/><i><font color="Green">E26</font></i>: 
( <font color="Maroon">X1</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">X2</font> &amp; <font color="Maroon">Y1</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">Y2</font> )
 ;<br/>

<b>let </b><font color="Maroon">f</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E2:88"/>
<font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="partfun1.html#K4" target="_self">PFuncs</a> <font color="Maroon">X1</font>,<font color="Maroon">Y1</font>
 ;<br/>

<a NAME="E3:88"/><b>then </b>
<font color="Maroon">f</font> is   <a href="partfun1.html#NM1">PartFunc</a> of <font color="Maroon">X1</font>,<font color="Maroon">Y1</font>
 
<b>by </b><i/>;<br/>
<a NAME="E4:88"/><b>then </b>
<font color="Maroon">f</font> is   <a href="partfun1.html#NM1">PartFunc</a> of <font color="Maroon">X2</font>,<font color="Maroon">Y2</font>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E5:88"/>
<font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="partfun1.html#K4" target="_self">PFuncs</a> <font color="Maroon">X2</font>,<font color="Maroon">Y2</font>
 <b>by </b><i/>;<br/>


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