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<b>let </b><font color="Maroon">v1</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">v2</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">v3</font> be    <a href="hidden.html#M1">set</a> ;<br/>





<b>thus </b> <a href="finseq_3.html#K2">Del</a> <span class="p1"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><font color="Maroon">v1</font></span><a href="finseq_1.html#K9">*&gt;</a></span>,1 = 
 <a href="finseq_3.html#K2">Del</a> <span class="p1">(<span class="default"><span class="p2"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><font color="Maroon">v1</font></span><a href="finseq_1.html#K9">*&gt;</a></span> <a href="finseq_1.html#K7">^</a> <a href="xboole_0.html#K1">{}</a> </span>)</span>,1
<b>by </b><i><a class="ref" href="finseq_1.html#T47">FINSEQ_1:47</a></i>
<br/>.= 
 <a href="xboole_0.html#K1">{}</a> 
<b>by </b><i><a class="ref" href="wsierp_1.html#T2" target="_self">Th2</a></i>
;<br/>

<b>thus </b><a NAME="E2:54"/>
 <a href="finseq_3.html#K2">Del</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">v1</font>,<font color="Maroon">v2</font></span><a href="finseq_1.html#K10">*&gt;</a></span>,1 <a href="hidden.html#R1">=</a> <span class="p1"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><font color="Maroon">v2</font></span><a href="finseq_1.html#K9">*&gt;</a></span>
 <b>by </b><i><a class="ref" href="wsierp_1.html#T2" target="_self">Th2</a></i>;<br/>

<a NAME="E3:54"/>
 <a href="finseq_1.html#K3">len</a> <span class="p1"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><font color="Maroon">v1</font></span><a href="finseq_1.html#K9">*&gt;</a></span> <a href="hidden.html#R1">=</a> 1
 
<b>by </b><i><a class="ref" href="finseq_1.html#T56">FINSEQ_1:56</a></i>;<br/>
<b>hence </b><i><font color="Green">E40</font></i>:  <a href="finseq_3.html#K2">Del</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">v1</font>,<font color="Maroon">v2</font></span><a href="finseq_1.html#K10">*&gt;</a></span>,2 = 
 <a href="finseq_3.html#K2">Del</a> <span class="p1">(<span class="default"><span class="p2"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><font color="Maroon">v1</font></span><a href="finseq_1.html#K9">*&gt;</a></span> <a href="finseq_1.html#K7">^</a> <span class="p2"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><font color="Maroon">v2</font></span><a href="finseq_1.html#K9">*&gt;</a></span></span>)</span>,<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="finseq_1.html#K3">len</a> <span class="p3"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><font color="Maroon">v1</font></span><a href="finseq_1.html#K9">*&gt;</a></span></span>)</span> <a href="nat_1.html#K1">+</a> 1</span>)</span>

<br/>.= 
<span class="p1"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><font color="Maroon">v1</font></span><a href="finseq_1.html#K9">*&gt;</a></span>
<b>by </b><i><a class="ref" href="wsierp_1.html#T2" target="_self">Th2</a></i>
;<br/><br/>

<b>thus </b> <a href="finseq_3.html#K2">Del</a> <span class="p1"><a href="finseq_1.html#K11">&lt;*</a><span class="default"><font color="Maroon">v1</font>,<font color="Maroon">v2</font>,<font color="Maroon">v3</font></span><a href="finseq_1.html#K11">*&gt;</a></span>,1 = 
 <a href="finseq_3.html#K2">Del</a> <span class="p1">(<span class="default"><span class="p2"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><font color="Maroon">v1</font></span><a href="finseq_1.html#K9">*&gt;</a></span> <a href="finseq_1.html#K7">^</a> <span class="p2"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">v2</font>,<font color="Maroon">v3</font></span><a href="finseq_1.html#K10">*&gt;</a></span></span>)</span>,1
<b>by </b><i><a class="ref" href="finseq_1.html#T60">FINSEQ_1:60</a></i>
<br/>.= 
<span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">v2</font>,<font color="Maroon">v3</font></span><a href="finseq_1.html#K10">*&gt;</a></span>
<b>by </b><i><a class="ref" href="wsierp_1.html#T2" target="_self">Th2</a></i>
;<br/>

<a NAME="E6:54"/><i><font color="Green">E41</font></i>: 
 <a href="finseq_1.html#K3">len</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">v1</font>,<font color="Maroon">v2</font></span><a href="finseq_1.html#K10">*&gt;</a></span> <a href="hidden.html#R1">=</a> 2
 
<b>by </b><i><a class="ref" href="finseq_1.html#T61">FINSEQ_1:61</a></i>;<br/>
<a NAME="E7:54"/><b>then </b><i><font color="Green">E48</font></i>: 
( 2 <a href="xxreal_0.html#R1">&lt;=</a>  <a href="finseq_1.html#K3">len</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">v1</font>,<font color="Maroon">v2</font></span><a href="finseq_1.html#K10">*&gt;</a></span> &amp; <span class="p1">(<span class="default"><a href="finseq_1.html#K3">len</a> <span class="p2"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">v1</font>,<font color="Maroon">v2</font></span><a href="finseq_1.html#K10">*&gt;</a></span></span>)</span> <a href="nat_1.html#K1">+</a> 1 <a href="hidden.html#R1">=</a> 3 )
 
;<br/>
<b>thus </b><a NAME="E8:54"/>
 <a href="finseq_3.html#K2">Del</a> <span class="p1"><a href="finseq_1.html#K11">&lt;*</a><span class="default"><font color="Maroon">v1</font>,<font color="Maroon">v2</font>,<font color="Maroon">v3</font></span><a href="finseq_1.html#K11">*&gt;</a></span>,2 <a href="hidden.html#R1">=</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">v1</font>,<font color="Maroon">v3</font></span><a href="finseq_1.html#K10">*&gt;</a></span>
 <b>by </b><i><a class="txt" href="wsierp_1.html#E4:54"><i><font color="Green">E40</font></i></a>, <a class="txt" href="wsierp_1.html#E6:54"><i><font color="Green">E41</font></i></a>, </i>;<br/>

<b>thus </b><a NAME="E9:54"/>
 <a href="finseq_3.html#K2">Del</a> <span class="p1"><a href="finseq_1.html#K11">&lt;*</a><span class="default"><font color="Maroon">v1</font>,<font color="Maroon">v2</font>,<font color="Maroon">v3</font></span><a href="finseq_1.html#K11">*&gt;</a></span>,3 <a href="hidden.html#R1">=</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">v1</font>,<font color="Maroon">v2</font></span><a href="finseq_1.html#K10">*&gt;</a></span>
 <b>by </b><i><a class="ref" href="wsierp_1.html#T3" target="_self">Th3</a>, <a class="ref" href="wsierp_1.html#T2" target="_self">Th2</a></i>;<br/>


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