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<b>let </b><font color="Maroon" title="c1">n</font> be  <a href="abian.html#V1" title="ABIAN:attr.1">even</a> <a href="int_1.html#NM1" title="INT_1:NM.1">Integer</a>;<br/>

<a NAME="E1:5"/>
<span class="p1">(<span class="default"><a href="xcmplx_0.html#K4" title="XCMPLX_0:func.4">-</a> 1</span>)</span> <a href="power.html#K3" title="POWER:func.3">to_power</a> <font color="Maroon" title="c1">n</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1 <a href="power.html#K3" title="POWER:func.3">to_power</a> <font color="Maroon" title="c1">n</font>
 
<b>by </b><i><a class="ref" href="fib_num2.html#T4" target="_self" title="FIB_NUM2:th.4">Th4</a></i>;<br/>
<b>hence </b><a NAME="E2:5"/>
<span class="p1">(<span class="default"><a href="xcmplx_0.html#K4" title="XCMPLX_0:func.4">-</a> 1</span>)</span> <a href="power.html#K3" title="POWER:func.3">to_power</a> <font color="Maroon" title="c1">n</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1
 <b>by </b><i><a class="ref" href="power.html#T31" title="POWER:th.31">POWER:31</a></i>;<br/>


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