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<b>let </b><font color="Maroon" title="c1">a</font> be   <a href="newton.html#NM1" title="NEWTON:NM.1">Prime</a>;<br/>

<a NAME="E1:5_1_1"/>
<font color="Maroon" title="c1">a</font> <a href="xxreal_0.html#NR4" title="XXREAL_0:NR.4">&gt;</a> 1
 
<b>by </b><i><a class="ref" href="int_2.html#D5" title="INT_2:def.5">INT_2:def 5</a></i>;<br/>
<a NAME="E2:5_1_1"/><b>then </b>
<font color="Maroon" title="c1">a</font> <a href="xxreal_0.html#NR4" title="XXREAL_0:NR.4">&gt;</a> 0
 
;<br/>
<b>hence </b><a NAME="E3:5_1_1"/>
not <font color="Maroon" title="c1">a</font> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>
 ;<br/>


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