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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="seqfunc.html#M1" target="_self">Functional_Sequence</a> of <font color="Maroon">c<sub>1</sub></font>, <a href="numbers.html#K1">REAL</a> ;<br/>



<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="27_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">c<sub>3</sub></font> be   <a href="nat_1.html#NM1">Nat</a>;<br/><b>thus </b><span class="p1">(<span class="default"><a href="seqfunc.html#K5" target="_self">abs</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="seqfunc.html#K3" target="_self">"</a> </span>)</span></span>)</span> <a href="seqfunc.html#K1" target="_self">.</a> <font color="Maroon">c<sub>3</sub></font> = 
 <a href="seq_1.html#K21">abs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="seqfunc.html#K3" target="_self">"</a> </span>)</span> <a href="seqfunc.html#K1" target="_self">.</a> <font color="Maroon">c<sub>3</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="seqfunc.html#D5" target="_self">Def5</a></i>
<br/>.= 
 <a href="seq_1.html#K21">abs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="seqfunc.html#K1" target="_self">.</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="rfunct_1.html#K4">^</a> </span>)</span>
<b>by </b><i><a class="ref" href="seqfunc.html#D3" target="_self">Def3</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="seq_1.html#K21">abs</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="seqfunc.html#K1" target="_self">.</a> <font color="Maroon">c<sub>3</sub></font></span>)</span></span>)</span> <a href="rfunct_1.html#K4">^</a> 
<b>by </b><i><a class="ref" href="rfunct_1.html#T46">RFUNCT_1:46</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="seqfunc.html#K5" target="_self">abs</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="seqfunc.html#K1" target="_self">.</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="rfunct_1.html#K4">^</a> 
<b>by </b><i><a class="ref" href="seqfunc.html#D5" target="_self">Def5</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="seqfunc.html#K5" target="_self">abs</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="seqfunc.html#K3" target="_self">"</a> </span>)</span> <a href="seqfunc.html#K1" target="_self">.</a> <font color="Maroon">c<sub>3</sub></font>
<b>by </b><i><a class="ref" href="seqfunc.html#D3" target="_self">Def3</a></i>
;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E2:27"/>
<span class="p1">(<span class="default"><a href="seqfunc.html#K5" target="_self">abs</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="seqfunc.html#K3" target="_self">"</a>  <a href="hidden.html#R1">=</a>  <a href="seqfunc.html#K5" target="_self">abs</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="seqfunc.html#K3" target="_self">"</a> </span>)</span>
 <b>by </b><i><a class="ref" href="seqfunc.html#T2" target="_self">Th2</a></i>;<br/>


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