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<b>let </b><font color="Maroon">n</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">h</font> be   <a href="int_1.html#NM1">Integer</a>, <font color="Maroon">i</font> be   <a href="int_1.html#NM1">Integer</a>;<br/>



<b>assume </b><a NAME="E1:35"/><i><font color="Green">E39</font></i>: 
( ( ( <font color="Maroon">h</font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0 &amp; <font color="Maroon">i</font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0 ) or ( <font color="Maroon">h</font> <a href="xxreal_0.html#R1">&lt;</a> 0 &amp; <font color="Maroon">i</font> <a href="xxreal_0.html#R1">&lt;</a> 0 ) ) &amp; <font color="Maroon">h</font>,<font color="Maroon">i</font> <a href="int_1.html#R1">are_congruent_mod</a> 2 <a href="series_1.html#K3">to_power</a> <font color="Maroon">n</font> )
 ;<br/>

<a NAME="E2:35"/>
<font color="Maroon">h</font> <a href="int_1.html#K6">mod</a> <span class="p1">(<span class="default">2 <a href="series_1.html#K3">to_power</a> <font color="Maroon">n</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">i</font> <a href="int_1.html#K6">mod</a> <span class="p1">(<span class="default">2 <a href="series_1.html#K3">to_power</a> <font color="Maroon">n</font></span>)</span>
 
<b>by </b><i>, <a class="ref" href="int_3.html#T12">INT_3:12</a></i>;<br/>
<b>hence </b><a NAME="E3:35"/>
 <a href="binari_4.html#K2" target="_self">2sComplement</a> <font color="Maroon">n</font>,<font color="Maroon">h</font> <a href="hidden.html#R1">=</a>  <a href="binari_4.html#K2" target="_self">2sComplement</a> <font color="Maroon">n</font>,<font color="Maroon">i</font>
 <b>by </b><i>, , </i>;<br/>


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