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

<b>assume </b><a NAME="E1:12"/>
0 <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">a</font>
 ;<br/>

<b>hence </b><a NAME="E2:12"/>
( 0 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">a</font> <a href="square_1.html#K3" target="_self">^2</a>  &amp; <font color="Maroon">a</font> <a href="square_1.html#K3" target="_self">^2</a>  <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0 )
 <b>by </b><i>, </i>; <i><font color="Red">:: according to </font></i><a class="ref" href="real_1.html#D5">REAL_1:def 5</a><br/>


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