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<b>let </b><font color="Maroon">f</font> be   <a href="sppol_2.html#NM1">S-Sequence_in_R2</a>;<br/>

<b>set </b><font color="Maroon">g</font> =  <a href="finseq_5.html#K4">Rev</a> <font color="Maroon">f</font>;<br/>
<b>thus </b><a NAME="E1:69"/>
 <a href="finseq_5.html#K4">Rev</a> <font color="Maroon">f</font> is <a href="funct_1.html#V2">one-to-one</a>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="topreal1.html#D10">TOPREAL1:def 10</a><br/>

<a NAME="E2:69"/>
 <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default"><a href="finseq_5.html#K4">Rev</a> <font color="Maroon">f</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Maroon">f</font>
 
<b>by </b><i><a class="ref" href="finseq_5.html#D3">FINSEQ_5:def 3</a></i>;<br/>
<b>hence </b><a NAME="E3:69"/>
 <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default"><a href="finseq_5.html#K4">Rev</a> <font color="Maroon">f</font></span>)</span> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 2
 <b>by </b><i><a class="ref" href="topreal1.html#D10">TOPREAL1:def 10</a></i>;<br/>

<b>thus </b><a NAME="E4:69"/>
(  <a href="finseq_5.html#K4">Rev</a> <font color="Maroon">f</font> is <a href="topreal1.html#V2">unfolded</a> &amp;  <a href="finseq_5.html#K4">Rev</a> <font color="Maroon">f</font> is <a href="topreal1.html#V3">s.n.c.</a> &amp;  <a href="finseq_5.html#K4">Rev</a> <font color="Maroon">f</font> is <a href="topreal1.html#V1">special</a> )
 <b>by </b><i>, , </i>;<br/>


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