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<b>take </b>
1
; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> not 1 is <a href="abian.html#V1" title="ABIAN:attr.1">even</a></span><br/>

<b>assume </b><a NAME="E1:4_4_1"/>
1 is <a href="abian.html#V1" title="ABIAN:attr.1">even</a>
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> contradiction</span><br/>

<b>then consider </b><font color="Maroon" title="c1">k</font> being   <a href="int_1.html#NM1" title="INT_1:NM.1">Integer</a><b> such that </b><br/><a NAME="E3:4_4_1"/><i><font color="Green" title="E2">A1</font></i>: 
1 <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 2 <a href="xcmplx_0.html#K3" title="XCMPLX_0:func.3">*</a> <font color="Maroon" title="c1">k</font>
 <b>by </b><i><a class="ref" href="abian.html#D1" target="_self" title="ABIAN:def.1">Def1</a></i>;<br/>
<b>thus </b><a NAME="E4:4_4_1"/>
contradiction
 <b>by </b><i><a class="txt" href="#E3:4_4_1"><i><font color="Green" title="E2">A1</font></i></a>, <a class="ref" href="int_1.html#T22" title="INT_1:th.22">INT_1:22</a></i>; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> verum</span><br/>


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