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<b>consider </b><font color="Maroon">c<sub>2</sub></font> being   <a href="int_1.html#NM1">Integer</a><b> such that </b><br/><a NAME="E2:9_1_1"/><i><font color="Green">E3</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default">2 <a href="xcmplx_0.html#K3">*</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="xcmplx_0.html#K2">+</a> 1
 <b>by </b><i><a class="ref" href="abian.html#T1" target="_self">Th1</a></i>;<br/>
<a NAME="E3:9_1_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="xcmplx_0.html#K2">+</a> 1 <a href="hidden.html#R1">=</a> 2 <a href="xcmplx_0.html#K3">*</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="xcmplx_0.html#K2">+</a> 1</span>)</span>
 
<b>by </b><i><a class="txt" href="abian.html#E2:9_1_1"><i><font color="Green">E3</font></i></a></i>;<br/>
<b>hence </b><a NAME="E4:9_1_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="xcmplx_0.html#K2">+</a> 1 is <a href="abian.html#V1" target="_self">even</a>
 ;<br/>


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