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<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="trees_4.html#M1">FinSequence</a> of  <a href="numbers.html#K5">NAT</a> ] <b>means </b> <a href="rvsum_1.html#K15">Sum</a> <font color="Maroon">a<sub>1</sub></font> is    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>
<a NAME="E1:44_1_1"/><i><font color="Green">E40</font></i>: 
<font color="Maroon">S<sub>1</sub></font>[ <a href="wsierp_1.html#K5" target="_self">&lt;*&gt;</a> <a href="numbers.html#K5">NAT</a> ]
 
<b>by </b><i><a class="ref" href="rvsum_1.html#T102">RVSUM_1:102</a></i>;<br/>
<div><i><font color="Green">E41</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="44_1_1_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">fp</font> be    <a href="trees_4.html#M1">FinSequence</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">a</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>assume </b><a NAME="E1:44_1_1_1"/>
<font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">fp</font>]
 ;<br/><b>then reconsider </b><font color="Maroon">sp</font> =  <a href="rvsum_1.html#K15">Sum</a> <font color="Maroon">fp</font> as    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  ;<br/><a NAME="E3:44_1_1_1"/>
 <a href="rvsum_1.html#K15">Sum</a> <span class="p1">(<span class="default"><font color="Maroon">fp</font> <a href="wsierp_1.html#K4" target="_self">^</a> <span class="p2"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><font color="Maroon">a</font></span><a href="finseq_1.html#K12">*&gt;</a></span></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">sp</font> <a href="nat_1.html#K1">+</a> <font color="Maroon">a</font>
 <b>by </b><i><a class="ref" href="rvsum_1.html#T104">RVSUM_1:104</a></i>;<br/><b>hence </b><a NAME="E4:44_1_1_1"/>
<font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">fp</font> <a href="wsierp_1.html#K4" target="_self">^</a> <span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><font color="Maroon">a</font></span><a href="finseq_1.html#K12">*&gt;</a></span>]
 ;<br/></div><b>end;</b></div>
<a NAME="E3:44_1_1"/>
for <font color="Olive">fp</font> being   <a href="trees_4.html#M1">FinSequence</a> of  <a href="numbers.html#K5">NAT</a>  holds  <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">fp</font>]
 
<b>from </b><i><a class="ref" href="finseq_2.html#S2">FINSEQ_2:sch 2</a>(, );<br/></i>
<b>hence </b><a NAME="E4:44_1_1"/>
 <a href="rvsum_1.html#K15">Sum</a> <font color="Maroon">fp</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> 
 ;<br/>


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