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<b>let </b><font color="Maroon">A</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">b1</font> be   <a href="uproots.html#NM1">Rbag</a> of <font color="Maroon">A</font>, <font color="Maroon">b2</font> be   <a href="uproots.html#NM1">Rbag</a> of <font color="Maroon">A</font>;<br/>



<b>assume </b><a NAME="E1:6"/><i><font color="Green">E34</font></i>: 
for <font color="Olive">x</font> being   <a href="hidden.html#M1">set</a>   st <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">A</font> holds <br/><font color="Maroon">b1</font> <a href="seq_1.html#K1">.</a> <font color="Olive">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">b2</font> <a href="seq_1.html#K1">.</a> <font color="Olive">x</font>
 ;<br/>

<a NAME="E2:6"/><b>then </b>
for <font color="Olive">x</font> being   <a href="hidden.html#M1">set</a>   st <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">A</font> holds <br/><font color="Maroon">b1</font> <a href="seq_1.html#K1">.</a> <font color="Olive">x</font> <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">b2</font> <a href="seq_1.html#K1">.</a> <font color="Olive">x</font>
 
;<br/>
<a NAME="E3:6"/><b>then </b><i><font color="Green">E35</font></i>: 
 <a href="uproots.html#K3">Sum</a> <font color="Maroon">b1</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="uproots.html#K3">Sum</a> <font color="Maroon">b2</font>
 
<b>by </b><i/>;<br/>
<a NAME="E4:6"/>
for <font color="Olive">x</font> being   <a href="hidden.html#M1">set</a>   st <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">A</font> holds <br/><font color="Maroon">b2</font> <a href="seq_1.html#K1">.</a> <font color="Olive">x</font> <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">b1</font> <a href="seq_1.html#K1">.</a> <font color="Olive">x</font>
 
<b>by </b><i/>;<br/>
<a NAME="E5:6"/><b>then </b>
 <a href="uproots.html#K3">Sum</a> <font color="Maroon">b2</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="uproots.html#K3">Sum</a> <font color="Maroon">b1</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E6:6"/>
 <a href="uproots.html#K3">Sum</a> <font color="Maroon">b1</font> <a href="hidden.html#R1">=</a>  <a href="uproots.html#K3">Sum</a> <font color="Maroon">b2</font>
 <b>by </b><i>, <a class="ref" href="xxreal_0.html#T1">XXREAL_0:1</a></i>;<br/>


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