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<b>let </b><font color="Maroon">N</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">seq</font> be   <a href="toprns_1.html#NM1">Real_Sequence</a> of <font color="Maroon">N</font>;<br/>



<b>assume </b><a NAME="E1:28"/>
<font color="Maroon">seq</font> is <a href="toprns_1.html#V1" target="_self">non-zero</a>
 ;<br/>

<a NAME="E2:28"/><b>then </b>
<span class="p1">(<span class="default"><a href="real_1.html#K1">-</a> 1</span>)</span> <a href="toprns_1.html#K2" target="_self">*</a> <font color="Maroon">seq</font> is <a href="toprns_1.html#V1" target="_self">non-zero</a>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:28"/>
 <a href="toprns_1.html#K3" target="_self">-</a> <font color="Maroon">seq</font> is <a href="toprns_1.html#V1" target="_self">non-zero</a>
 <b>by </b><i/>;<br/>


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