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<b>let </b><font color="Maroon">b1</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> , <font color="Maroon">b2</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> , <font color="Maroon">c</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>

<b>assume </b><a NAME="E1:6"/><i><font color="Green">E33</font></i>: 
<font color="Maroon">b2</font> <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">c</font>
 ;<br/>

<a NAME="E2:6"/><i><font color="Green">E35</font></i>: 
<font color="Maroon">c</font> <a href="xcmplx_0.html#K6">-</a> <font color="Maroon">b1</font> <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">c</font>
 
<b>by </b><i/>;<br/>
<a NAME="E3:6"/>
<font color="Maroon">b2</font> <a href="xcmplx_0.html#K6">-</a> <font color="Maroon">b1</font> <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">c</font> <a href="xcmplx_0.html#K6">-</a> <font color="Maroon">b1</font>
 
<b>by </b><i>, <a class="ref" href="xreal_1.html#T11">XREAL_1:11</a></i>;<br/>
<b>hence </b><a NAME="E4:6"/>
<font color="Maroon">b2</font> <a href="xcmplx_0.html#K6">-</a> <font color="Maroon">b1</font> <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">c</font>
 <b>by </b><i>, <a class="ref" href="xxreal_0.html#T2">XXREAL_0:2</a></i>;<br/>


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