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<b>let </b><font color="Maroon" title="c1">R</font> be  non <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a> <a href="rlvect_1.html#V4" title="RLVECT_1:attr.4">add-associative</a> <a href="rlvect_1.html#V5" title="RLVECT_1:attr.5">right_zeroed</a> <a href="algstr_1.html#V1" title="ALGSTR_1:attr.1">left_zeroed</a>  <a href="rlvect_1.html#L1" title="RLVECT_1:struct.1">LoopStr</a> ;<br/><b>let </b><font color="Maroon" title="c2">a</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">R</font>;<br/><b>let </b><font color="Maroon" title="c3">n</font> be    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="numbers.html#K5" title="NUMBERS:func.5">NAT</a> ;<br/>





<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="numbers.html#K5" title="NUMBERS:func.5">NAT</a> ] <b>means </b>$1 <a href="binom.html#K5" title="BINOM:func.5">*</a> <font color="Maroon" title="c2">a</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">a</font> <a href="binom.html#K6" title="BINOM:func.6">*</a> $1;<br/>
0 <a href="binom.html#K5" title="BINOM:func.5">*</a> <font color="Maroon" title="c2">a</font> = 
 <a href="struct_0.html#K4" title="STRUCT_0:func.4">0.</a> <font color="Maroon" title="c1">R</font>
<b>by </b><i><a class="ref" href="binom.html#D6" target="_self" title="BINOM:def.6">Def6</a></i>
<br/>.= 
<font color="Maroon" title="c2">a</font> <a href="binom.html#K6" title="BINOM:func.6">*</a> 0
<b>by </b><i><a class="ref" href="binom.html#D7" target="_self" title="BINOM:def.7">Def7</a></i>
;<br/>
<a NAME="E2:28"/><b>then </b><i><font color="Green" title="E17">A1</font></i>: 
<font color="Maroon">S<sub>1</sub></font>[0]
 
;<br/>
<div><i><font color="Green" title="E18">A2</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="28_2"><b>now </b></a><div class="add"><b>let </b><font color="Maroon" title="c4">k</font> be    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="numbers.html#K5" title="NUMBERS:func.5">NAT</a> ;<br/><b>assume </b><a NAME="E1:28_2"/><i><font color="Green" title="E19">A3</font></i>: 
<font color="Maroon">S<sub>1</sub></font>[<font color="Maroon" title="c4">k</font>]
 ;<br/><span class="p1">(<span class="default"><font color="Maroon" title="c4">k</font> <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1</span>)</span> <a href="binom.html#K5" title="BINOM:func.5">*</a> <font color="Maroon" title="c2">a</font> = 
<span class="p1">(<span class="default"><font color="Maroon" title="c4">k</font> <a href="binom.html#K5" title="BINOM:func.5">*</a> <font color="Maroon" title="c2">a</font></span>)</span> <a href="rlvect_1.html#K1" title="RLVECT_1:func.1">+</a> <span class="p1">(<span class="default">1 <a href="binom.html#K5" title="BINOM:func.5">*</a> <font color="Maroon" title="c2">a</font></span>)</span>
<b>by </b><i><a class="ref" href="binom.html#T16" target="_self" title="BINOM:th.16">Th16</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon" title="c4">k</font> <a href="binom.html#K5" title="BINOM:func.5">*</a> <font color="Maroon" title="c2">a</font></span>)</span> <a href="rlvect_1.html#K1" title="RLVECT_1:func.1">+</a> <font color="Maroon" title="c2">a</font>
<b>by </b><i><a class="ref" href="binom.html#T14" target="_self" title="BINOM:th.14">Th14</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon" title="c2">a</font> <a href="binom.html#K6" title="BINOM:func.6">*</a> <font color="Maroon" title="c4">k</font></span>)</span> <a href="rlvect_1.html#K1" title="RLVECT_1:func.1">+</a> <span class="p1">(<span class="default"><font color="Maroon" title="c2">a</font> <a href="binom.html#K6" title="BINOM:func.6">*</a> 1</span>)</span>
<b>by </b><i><a class="txt" href="binom.html#E1:28_2"><i><font color="Green" title="E19">A3</font></i></a>, <a class="ref" href="binom.html#T15" target="_self" title="BINOM:th.15">Th15</a></i>
<br/>.= 
<font color="Maroon" title="c2">a</font> <a href="binom.html#K6" title="BINOM:func.6">*</a> <span class="p1">(<span class="default"><font color="Maroon" title="c4">k</font> <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1</span>)</span>
<b>by </b><i><a class="ref" href="binom.html#T17" target="_self" title="BINOM:th.17">Th17</a></i>
;<br/><b>hence </b><a NAME="E3:28_2"/>
<font color="Maroon">S<sub>1</sub></font>[<font color="Maroon" title="c4">k</font> <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1]
 ;<br/></div><b>end;</b></div>
<a NAME="E4:28"/>
for <font color="Olive" title="b1">n</font> being   <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="numbers.html#K5" title="NUMBERS:func.5">NAT</a>  holds  <font color="Maroon">S<sub>1</sub></font>[<font color="Olive" title="b1">n</font>]
 
<b>from </b><i><a class="ref" href="nat_1.html#S1" title="NAT_1:sch.1">NAT_1:sch 1</a>(<a class="txt" href="binom.html#E2:28"><i><font color="Green" title="E17">A1</font></i></a>, <a class="txt" href="binom.html#E3:28"><i><font color="Green" title="E18">A2</font></i></a>);<br/></i>
<b>hence </b><a NAME="E5:28"/>
<font color="Maroon" title="c3">n</font> <a href="binom.html#K5" title="BINOM:func.5">*</a> <font color="Maroon" title="c2">a</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">a</font> <a href="binom.html#K6" title="BINOM:func.6">*</a> <font color="Maroon" title="c3">n</font>
 ;<br/>


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