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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="afinsq_1.html#NM1">XFinSequence</a>;<br/>



<a NAME="E1:65"/>
(  <a href="afinsq_1.html#K2" target="_self">dom</a> <span class="p1"><a href="afinsq_1.html#K6" target="_self">&lt;%</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="afinsq_1.html#K6" target="_self">%&gt;</a></span> <a href="hidden.html#R1">=</a> 1 &amp; 1 <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0 &amp; 1 <a href="hidden.html#R1">=</a> 0 <a href="nat_1.html#K1">+</a> 1 )
 
<b>by </b><i><a class="ref" href="afinsq_1.html#D5" target="_self">Def5</a></i>;<br/>
<a NAME="E2:65"/><b>then </b>
( 0 <a href="hidden.html#R2">in</a>  <a href="afinsq_1.html#K2" target="_self">dom</a> <span class="p1"><a href="afinsq_1.html#K6" target="_self">&lt;%</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="afinsq_1.html#K6" target="_self">%&gt;</a></span> &amp; <span class="p1">(<span class="default"><a href="afinsq_1.html#K1" target="_self">len</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="nat_1.html#K1">+</a> 0 <a href="hidden.html#R1">=</a>  <a href="afinsq_1.html#K1" target="_self">len</a> <font color="Maroon">c<sub>2</sub></font> )
 
<b>by </b><i><a class="ref" href="afinsq_1.html#T1" target="_self">Th1</a></i>;<br/>
<b>hence </b><span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="ordinal4.html#K1">^</a> <span class="p2"><a href="afinsq_1.html#K6" target="_self">&lt;%</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="afinsq_1.html#K6" target="_self">%&gt;</a></span></span>)</span> <a href="funct_1.html#K1">.</a> <span class="p1">(<span class="default"><a href="afinsq_1.html#K1" target="_self">len</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> = 
<span class="p1"><a href="afinsq_1.html#K6" target="_self">&lt;%</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="afinsq_1.html#K6" target="_self">%&gt;</a></span> <a href="funct_1.html#K1">.</a> 0
<b>by </b><i><a class="ref" href="afinsq_1.html#D4" target="_self">Def4</a></i>
<br/>.= 
<font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="ref" href="afinsq_1.html#D5" target="_self">Def5</a></i>
;<br/><br/>


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