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<b>let </b><font color="Maroon" title="c1">n</font> be   <a href="nat_1.html#NM1" title="NAT_1:NM.1">Nat</a>;<br/>

<b>assume </b><a NAME="E1:7"/><i><font color="Green" title="E6">A1</font></i>: 
<font color="Maroon" title="c1">n</font> <a href="xxreal_0.html#NR2" title="XXREAL_0:NR.2">&gt;=</a> 1
 ;<br/>

<b>hence </b><font color="Maroon" title="c1">n</font> <a href="power.html#K1" title="POWER:func.1">-root</a> 0 = 
<font color="Maroon" title="c1">n</font> <a href="prepower.html#K2" title="PREPOWER:func.2">-Root</a> 0
<b>by </b><i><a class="ref" href="power.html#D1" target="_self" title="POWER:def.1">Def1</a></i>
<br/>.= 
0
<b>by </b><i><a class="txt" href="power.html#E1:7"><i><font color="Green" title="E6">A1</font></i></a>, <a class="ref" href="prepower.html#D3" title="PREPOWER:def.3">PREPOWER:def 3</a></i>
;<br/><br/>


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