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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E22">Th21</font></span>: <a NAME="T21"><span class="comment"><font color="firebrick">:: CATALAN2:21</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">m</font>, <font color="Olive" title="b2">n</font> being   <a href="ordinal1.html#NM6" title="ORDINAL1:NM.6">Nat</a> holds   <a href="catalan2.html#K2" title="CATALAN2:func.2">Domin_0</a> (<font color="Olive" title="b2">n</font>,<font color="Olive" title="b1">m</font>) <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="card_fin.html#K1" title="CARD_FIN:func.1">Choose</a> (<font color="Olive" title="b2">n</font>,<font color="Olive" title="b1">m</font>,1,<a href="numbers.html#K5" title="NUMBERS:func.5">0</a>)</div></div>
