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<b>let </b><font color="Maroon">X</font> be   <a href="subset_1.html#NM2">Subset</a> of <a href="hilbert1.html#K1" target="_self">HP-WFF</a> ;<br/><b>let </b><font color="Maroon">a</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="E1:28"/><i><font color="Green">E24</font></i>: 
<font color="Maroon">a</font> <a href="hidden.html#R2">in</a>  <a href="hilbert1.html#K5" target="_self">CnPos</a> <span class="p1">(<span class="default"><a href="hilbert1.html#K5" target="_self">CnPos</a> <font color="Maroon">X</font></span>)</span>
 ;<br/>

<b>then reconsider </b><font color="Maroon">t</font> = <font color="Maroon">a</font> as    <a href="subset_1.html#M1">Element</a> of  <a href="hilbert1.html#K1" target="_self">HP-WFF</a>  ;<br/>
<a NAME="E3:28"/>
for <font color="Olive">T</font> being  <a href="subset_1.html#NM2">Subset</a> of <a href="hilbert1.html#K1" target="_self">HP-WFF</a>   st <font color="Olive">T</font> is <a href="hilbert1.html#V6" target="_self">Hilbert_theory</a> &amp; <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <font color="Olive">T</font> holds <br/><font color="Maroon">t</font> <a href="hidden.html#R2">in</a> <font color="Olive">T</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="28_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">T</font> be   <a href="subset_1.html#NM2">Subset</a> of <a href="hilbert1.html#K1" target="_self">HP-WFF</a> ;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:28_1"/><i><font color="Green">E26</font></i>: 
<font color="Maroon">T</font> is <a href="hilbert1.html#V6" target="_self">Hilbert_theory</a>
 <b>and </b><br/><a NAME="E2:28_1"/><i><font color="Green">E27</font></i>: 
<font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">T</font>
 ;<br/>

<a NAME="E3:28_1"/>
 <a href="hilbert1.html#K5" target="_self">CnPos</a> <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">T</font>
 
<b>by </b><i>, , <a class="ref" href="hilbert1.html#D4" target="_self">Def4</a></i>;<br/>
<b>hence </b><a NAME="E4:28_1"/>
<font color="Maroon">t</font> <a href="hidden.html#R2">in</a> <font color="Maroon">T</font>
 <b>by </b><i><a class="ref" href="hilbert1.html#D6" target="_self">Def6</a>, , </i>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E4:28"/>
<font color="Maroon">a</font> <a href="hidden.html#R2">in</a>  <a href="hilbert1.html#K5" target="_self">CnPos</a> <font color="Maroon">X</font>
 <b>by </b><i/>;<br/>


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