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<b>let </b><font color="Maroon" title="c1">k</font>, <font color="Maroon" title="c2">i</font>, <font color="Maroon" title="c3">j</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><b>that </b><br/><a NAME="E1:52"/><i><font color="Green" title="E28">A1</font></i>: 
<font color="Maroon" title="c1">k</font> <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a> <font color="Maroon" title="c2">i</font>
 <b>and </b><br/><a NAME="E2:52"/><i><font color="Green" title="E29">A2</font></i>: 
<font color="Maroon" title="c2">i</font> <a href="xxreal_0.html#NR3" title="XXREAL_0:NR.3">&lt;</a> <font color="Maroon" title="c3">j</font>
 ;<br/>

<a NAME="E3:52"/><i><font color="Green" title="E30">A3</font></i>: 
<font color="Maroon" title="c1">k</font> <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a> <font color="Maroon" title="c3">j</font>
 
<b>by </b><i><a class="txt" href="binarith.html#E1:52"><i><font color="Green" title="E28">A1</font></i></a>, <a class="txt" href="binarith.html#E2:52"><i><font color="Green" title="E29">A2</font></i></a>, <a class="ref" href="xxreal_0.html#T2" title="XXREAL_0:th.2">XXREAL_0:2</a></i>;<br/>
<a NAME="E4:52"/>
<span class="p1">(<span class="default"><font color="Maroon" title="c2">i</font> <a href="binarith.html#K3" title="BINARITH:func.3">-'</a> <font color="Maroon" title="c1">k</font></span>)</span> <a href="xcmplx_0.html#K2" title="XCMPLX_0:func.2">+</a> <font color="Maroon" title="c1">k</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">i</font>
 
<b>by </b><i><a class="txt" href="binarith.html#E1:52"><i><font color="Green" title="E28">A1</font></i></a>, <a class="ref" href="binarith.html#T53" target="_self" title="BINARITH:th.53">Th53</a></i>;<br/>
<a NAME="E5:52"/><b>then </b>
<span class="p1">(<span class="default"><font color="Maroon" title="c2">i</font> <a href="binarith.html#K3" title="BINARITH:func.3">-'</a> <font color="Maroon" title="c1">k</font></span>)</span> <a href="xcmplx_0.html#K2" title="XCMPLX_0:func.2">+</a> <font color="Maroon" title="c1">k</font> <a href="xxreal_0.html#NR3" title="XXREAL_0:NR.3">&lt;</a> <span class="p1">(<span class="default"><font color="Maroon" title="c3">j</font> <a href="binarith.html#K3" title="BINARITH:func.3">-'</a> <font color="Maroon" title="c1">k</font></span>)</span> <a href="xcmplx_0.html#K2" title="XCMPLX_0:func.2">+</a> <font color="Maroon" title="c1">k</font>
 
<b>by </b><i><a class="txt" href="binarith.html#E2:52"><i><font color="Green" title="E29">A2</font></i></a>, <a class="txt" href="binarith.html#E3:52"><i><font color="Green" title="E30">A3</font></i></a>, <a class="ref" href="binarith.html#T53" target="_self" title="BINARITH:th.53">Th53</a></i>;<br/>
<b>hence </b><a NAME="E6:52"/>
<font color="Maroon" title="c2">i</font> <a href="binarith.html#K3" title="BINARITH:func.3">-'</a> <font color="Maroon" title="c1">k</font> <a href="xxreal_0.html#NR3" title="XXREAL_0:NR.3">&lt;</a> <font color="Maroon" title="c3">j</font> <a href="binarith.html#K3" title="BINARITH:func.3">-'</a> <font color="Maroon" title="c1">k</font>
 <b>by </b><i><a class="ref" href="xreal_1.html#T8" title="XREAL_1:th.8">XREAL_1:8</a></i>;<br/>


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