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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="comseq_1.html#NM1">Complex_Sequence</a>;<br/>

<b>assume </b><a NAME="E1:61"/><i><font color="Green">E44</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="comseq_1.html#V1" target="_self">non-zero</a>
 ;<br/>

<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="61_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="nat_1.html#NM1">Nat</a>;<br/><a NAME="E1:61_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="comseq_1.html#K1" target="_self">.</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="complex1.html#K5">0c</a> 
 <b>by </b><i><a class="txt" href="comseq_1.html#E1:61"><i><font color="Green">E44</font></i></a>, <a class="ref" href="comseq_1.html#T4" target="_self">Th4</a></i>;<br/><a NAME="E2:61_1"/><b>then </b>
<span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="comseq_1.html#K1" target="_self">.</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span><a href="complex1.html#K17">.|</a></span> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 <b>by </b><i><a class="ref" href="complex1.html#T131">COMPLEX1:131</a></i>;<br/><b>hence </b><a NAME="E3:61_1"/>
<span class="p1"><a href="comseq_1.html#K9" target="_self">|.</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="comseq_1.html#K9" target="_self">.|</a></span> <a href="seq_1.html#K2">.</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 <b>by </b><i><a class="ref" href="comseq_1.html#D14" target="_self">Def14</a></i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E3:61"/>
<span class="p1"><a href="comseq_1.html#K9" target="_self">|.</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="comseq_1.html#K9" target="_self">.|</a></span> <a href="seq_1.html#NR1" target="_self">is_not_0</a> 
 <b>by </b><i><a class="ref" href="seq_1.html#T7">SEQ_1:7</a></i>;<br/>


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