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<b>take </b>
1
;<br/>

<b>assume </b><a NAME="E1:5_4_1"/>
1 is <a href="abian.html#V1" target="_self">even</a>
 ;<br/>

<b>then consider </b><font color="Maroon">c<sub>1</sub></font> being   <a href="int_1.html#NM1">Integer</a><b> such that </b><br/><a NAME="E3:5_4_1"/><i><font color="Green">E2</font></i>: 
1 <a href="hidden.html#R1">=</a> 2 <a href="xcmplx_0.html#K3">*</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="abian.html#D1" target="_self">Def1</a></i>;<br/>
<b>thus </b><a NAME="E4:5_4_1"/>
contradiction
 <b>by </b><i><a class="txt" href="abian.html#E3:5_4_1"><i><font color="Green">E2</font></i></a>, <a class="ref" href="int_1.html#T22">INT_1:22</a></i>;<br/>


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