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<b>let </b><font color="Maroon" title="c1">i</font>, <font color="Maroon" title="c2">i1</font>, <font color="Maroon" title="c3">i2</font> be  <a href="ordinal1.html#V7" title="ORDINAL1:attr.7">natural</a>  <a href="ordinal1.html#NM1" title="ORDINAL1:NM.1">number</a> ;<br/>





<b>assume </b><a NAME="E1:46"/><i><font color="Green" title="E27">A1</font></i>: 
<font color="Maroon" title="c1">i</font> <a href="xxreal_0.html#NR2" title="XXREAL_0:NR.2">&gt;=</a> <font color="Maroon" title="c2">i1</font>
 ;<br/>

<a NAME="E2:46"/>
<font color="Maroon" title="c2">i1</font> <a href="xxreal_0.html#NR2" title="XXREAL_0:NR.2">&gt;=</a> <font color="Maroon" title="c2">i1</font> <a href="binarith.html#K3" title="BINARITH:func.3">-'</a> <font color="Maroon" title="c3">i2</font>
 
<b>by </b><i><a class="ref" href="binarith.html#T52" target="_self" title="BINARITH:th.52">Th52</a></i>;<br/>
<b>hence </b><a NAME="E3:46"/>
<font color="Maroon" title="c1">i</font> <a href="xxreal_0.html#NR2" title="XXREAL_0:NR.2">&gt;=</a> <font color="Maroon" title="c2">i1</font> <a href="binarith.html#K3" title="BINARITH:func.3">-'</a> <font color="Maroon" title="c3">i2</font>
 <b>by </b><i><a class="txt" href="binarith.html#E1:46"><i><font color="Green" title="E27">A1</font></i></a>, <a class="ref" href="xxreal_0.html#T2" title="XXREAL_0:th.2">XXREAL_0:2</a></i>;<br/>


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