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<b>let </b><font color="Maroon" title="c1">i</font> be   <a href="int_1.html#NM1" title="INT_1:NM.1">Integer</a>;<br/>

<div><b>hereby </b>
<div class="add"><b>assume </b><a NAME="E1:1_1"/>
<font color="Maroon" title="c1">i</font> is <a href="abian.html#V1" title="ABIAN:attr.1">even</a>
 ;<br/><b>then reconsider </b><font color="Maroon" title="c2">i0</font> = <font color="Maroon" title="c1">i</font> as  <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="E3:1_1"/>
not <font color="Maroon" title="c2">i0</font> <a href="xcmplx_0.html#K6" title="XCMPLX_0:func.6">-</a> 1 is <a href="abian.html#V1" title="ABIAN:attr.1">even</a>
 ;<br/><b>hence </b><a NAME="E4:1_1"/>
not <font color="Maroon" title="c1">i</font> <a href="xcmplx_0.html#K6" title="XCMPLX_0:func.6">-</a> 1 is <a href="abian.html#V1" title="ABIAN:attr.1">even</a>
 ;<br/></div>
<b>end;</b></div>

<b>assume </b><a NAME="E2:1"/>
not <font color="Maroon" title="c1">i</font> <a href="xcmplx_0.html#K6" title="XCMPLX_0:func.6">-</a> 1 is <a href="abian.html#V1" title="ABIAN:attr.1">even</a>
 ;<br/>

<b>then reconsider </b><font color="Maroon" title="c2">i1</font> = <font color="Maroon" title="c1">i</font> <a href="xcmplx_0.html#K6" title="XCMPLX_0:func.6">-</a> 1 as  <a href="abian.html#NV2" title="ABIAN:NV.2">odd</a> <a href="int_1.html#NM1" title="INT_1:NM.1">Integer</a> ;<br/>
<a NAME="E4:1"/>
<font color="Maroon" title="c2">i1</font> <a href="xcmplx_0.html#K2" title="XCMPLX_0:func.2">+</a> 1 is <a href="abian.html#V1" title="ABIAN:attr.1">even</a>
 
;<br/>
<b>hence </b><a NAME="E5:1"/>
<font color="Maroon" title="c1">i</font> is <a href="abian.html#V1" title="ABIAN:attr.1">even</a>
 <b>by </b><i><a class="ref" href="xcmplx_1.html#T27" title="XCMPLX_1:th.27">XCMPLX_1:27</a></i>;<br/>


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