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<b>let </b><font color="Maroon">f</font> be   <a href="funct_2.html#NM1">Function</a> of 2, <a href="numbers.html#K1">REAL</a> ;<br/>

<a NAME="E1:7"/>
( 0 <a href="hidden.html#R2">in</a> 2 &amp; 1 <a href="hidden.html#R2">in</a> 2 )
 
<b>by </b><i>, <a class="ref" href="tarski.html#D2">TARSKI:def 2</a></i>;<br/>
<b>then reconsider </b><font color="Maroon">a</font> = <font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> 0, <font color="Maroon">b</font> = <font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> 1 as    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K1">REAL</a>  <b>by </b><i><a class="ref" href="funct_2.html#T7">FUNCT_2:7</a></i>;<br/>
<b>take </b>
<font color="Maroon">a</font>
;<br/>

<b>take </b>
<font color="Maroon">b</font>
;<br/>

<a NAME="E3:7"/>
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">f</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="tarski.html#K2">{</a><span class="default">0,1</span><a href="tarski.html#K2">}</a></span>
 
<b>by </b><i>, <a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>;<br/>
<b>hence </b><a NAME="E4:7"/>
<font color="Maroon">f</font> <a href="funct_2.html#R1">=</a> 0,1 <a href="funct_4.html#K5">--&gt;</a> <font color="Maroon">a</font>,<font color="Maroon">b</font>
 <b>by </b><i><a class="ref" href="funct_4.html#T69">FUNCT_4:69</a></i>;<br/>


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