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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  <a href="xreal_0.html#V1">real</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>

<a NAME="E1:63"/>
( <span class="p1"><a href="int_1.html#K1" target="_self">[\</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="int_1.html#K1" target="_self">/]</a></span> <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">c<sub>1</sub></font> &amp; <font color="Maroon">c<sub>1</sub></font> <a href="xxreal_0.html#R1">&lt;=</a> <span class="p1"><a href="int_1.html#K2" target="_self">[/</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="int_1.html#K2" target="_self">\]</a></span> )
 
<b>by </b><i><a class="ref" href="int_1.html#D4" target="_self">Def4</a>, <a class="ref" href="int_1.html#D5" target="_self">Def5</a></i>;<br/>
<b>hence </b><a NAME="E2:63"/>
<span class="p1"><a href="int_1.html#K1" target="_self">[\</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="int_1.html#K1" target="_self">/]</a></span> <a href="xxreal_0.html#R1">&lt;=</a> <span class="p1"><a href="int_1.html#K2" target="_self">[/</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="int_1.html#K2" target="_self">\]</a></span>
 <b>by </b><i><a class="ref" href="xxreal_0.html#T2">XXREAL_0:2</a></i>;<br/>


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