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<b>let </b><font color="Maroon">n</font> be  <a href="abian.html#V1">even</a> <a href="int_1.html#NM1">Integer</a>;<br/><b>let </b><font color="Maroon">m</font> be  non <a href="xboole_0.html#V1">empty</a> <a href="xreal_0.html#V1">real</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>



<a NAME="E1:4"/>
( <font color="Maroon">m</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0 &amp;  ex <font color="Olive">l</font> being  <a href="int_1.html#NM1">Integer</a> st <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> 2 <a href="xcmplx_0.html#K3">*</a> <font color="Olive">l</font> )
 
<b>by </b><i><a class="ref" href="abian.html#D1">ABIAN:def 1</a></i>;<br/>
<b>hence </b><a NAME="E2:4"/>
<span class="p1">(<span class="default"><a href="xcmplx_0.html#K4">-</a> <font color="Maroon">m</font></span>)</span> <a href="power.html#K3">to_power</a> <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> <font color="Maroon">m</font> <a href="power.html#K3">to_power</a> <font color="Maroon">n</font>
 <b>by </b><i><a class="ref" href="power.html#T54">POWER:54</a></i>;<br/>


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