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<b>thus </b><a NAME="E1:74_1_1"/>
( <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">Y</font> implies for <font color="Olive">c</font> being <a href="xcmplx_0.html#V1">complex</a>  <a href="ordinal1.html#NM1" target="_self">number</a>   st <font color="Olive">c</font> <a href="hidden.html#R2">in</a> <font color="Maroon">X</font> holds <br/><font color="Olive">c</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Y</font> )
 ;<br/>

<b>assume </b><a NAME="E2:74_1_1"/><i><font color="Green">E18</font></i>: 
for <font color="Olive">c</font> being <a href="xcmplx_0.html#V1">complex</a>  <a href="ordinal1.html#NM1" target="_self">number</a>   st <font color="Olive">c</font> <a href="hidden.html#R2">in</a> <font color="Maroon">X</font> holds <br/><font color="Olive">c</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Y</font>
 ;<br/>

<b>let </b><font color="Maroon">x</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="E3:74_1_1"/><i><font color="Green">E19</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">X</font>
 ;<br/>

<a NAME="E4:74_1_1"/><b>then </b>
<font color="Maroon">x</font> is <a href="xcmplx_0.html#V1">complex</a>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E5:74_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Y</font>
 <b>by </b><i><a class="ref" href="membered.html#D5" target="_self">Def5</a>, <a class="txt" href="membered.html#E2:74_1_1"><i><font color="Green">E18</font></i></a></i>;<br/>


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