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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  <a href="xxreal_0.html#V1" target="_self">ext-real</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>

<b>assume </b><a NAME="E1:26_1_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="xxreal_0.html#D6" target="_self">XXREAL_0:def 6</a><br/>

<b>hence </b><a NAME="E2:26_1_1"/>
( <font color="Maroon">c<sub>1</sub></font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0 &amp; <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a>  )
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="xboole_0.html#D5">XBOOLE_0:def 5</a>,<a class="ref" href="xxreal_0.html#D7" target="_self">XXREAL_0:def 7</a><br/>


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