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<b>let </b><font color="Maroon" title="c2">k</font> be   <a href="newton.html#NM1" title="NEWTON:NM.1">Prime</a>;<br/>

<b>assume </b><a NAME="E1:57_1_1"/>
<font color="Maroon" title="c2">k</font> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>
 ;<br/>

<a NAME="E2:57_1_1"/><b>then </b>
<font color="Maroon" title="c2">k</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="newton.html#K14" title="NEWTON:func.14">SetPrimenumber</a> 2
 
<b>by </b><i><a class="ref" href="newton.html#D7" title="NEWTON:def.7">NEWTON:def 7</a></i>;<br/>
<b>hence </b><a NAME="E3:57_1_1"/>
contradiction
 ;<br/>


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