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 <a href="catalan1.html#K1" title="CATALAN1:func.1">Catalan</a> 1 = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default">2 <a href="nat_1.html#K4" title="NAT_1:func.4">*</a> 1</span>)</span> <a href="binarith.html#K3" title="BINARITH:func.3">-'</a> 2</span>)</span> <a href="newton.html#K9" title="NEWTON:func.9">choose</a> <a href="numbers.html#K6" title="NUMBERS:func.6">0</a> 
<b>by </b><i><a class="ref" href="binarith.html#T51" title="BINARITH:th.51">BINARITH:51</a></i>
<br/>.= 
1
<b>by </b><i><a class="ref" href="binarith.html#T51" title="BINARITH:th.51">BINARITH:51</a>, <a class="ref" href="newton.html#T27" title="NEWTON:th.27">NEWTON:27</a></i>
;<br/>
<b>hence </b><a NAME="E2:12"/>
 <a href="catalan1.html#K1" title="CATALAN1:func.1">Catalan</a> 1 <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1
 ;<br/>


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