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<i><font color="Green" title="E11">A1</font></i>: 2 <a href="nat_d.html#K7" title="NAT_D:func.7">-'</a> 1 = 
2 <a href="real_1.html#K9" title="REAL_1:func.9">-</a> 1
<b>by </b><i><a class="ref" href="xreal_1.html#T235" title="XREAL_1:th.235">XREAL_1:235</a></i>
<br/>.= 
1

;<br/>
4 <a href="nat_d.html#K7" title="NAT_D:func.7">-'</a> 2 = 
4 <a href="real_1.html#K9" title="REAL_1:func.9">-</a> 2
<b>by </b><i><a class="ref" href="xreal_1.html#T235" title="XREAL_1:th.235">XREAL_1:235</a></i>
<br/>.= 
2

;<br/>
<b>then </b> <a href="catalan1.html#K1" title="CATALAN1:func.1">Catalan</a> 2 = 
2 <a href="real_1.html#K10" title="REAL_1:func.10">/</a> 2
<b>by </b><i><a class="txt" href="#E1:12"><i><font color="Green" title="E11">A1</font></i></a>, <a class="ref" href="newton.html#T33" title="NEWTON:th.33">NEWTON:33</a></i>
<br/>.= 
1

;<br/>
<b>hence </b><a NAME="E4:12"/>
 <a href="catalan1.html#K1" title="CATALAN1:func.1">Catalan</a> 2 <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> verum</span><br/>


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