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<b>let </b><font color="Maroon">n</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">m</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">k</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>





<b>assume </b><a NAME="E1:10"/>
<font color="Maroon">n</font> <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">m</font>
 ;<br/>

<a NAME="E2:10"/><b>then </b>
<font color="Maroon">n</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">m</font>
 
<b>by </b><i><a class="ref" href="card_1.html#T56">CARD_1:56</a></i>;<br/>
<a NAME="E3:10"/><b>then </b>
<font color="Maroon">n</font> <a href="xboole_0.html#K3">/\</a> <font color="Maroon">m</font> <a href="hidden.html#R1">=</a> <font color="Maroon">n</font>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T28">XBOOLE_1:28</a></i>;<br/>
<b>hence </b><a NAME="E4:10"/>
<span class="p1">(<span class="default"><font color="Maroon">m</font> <a href="catalan2.html#K1" target="_self">--&gt;</a> <font color="Maroon">k</font></span>)</span> <a href="card_fin.html#K4">|</a> <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> <font color="Maroon">n</font> <a href="catalan2.html#K1" target="_self">--&gt;</a> <font color="Maroon">k</font>
 <b>by </b><i><a class="ref" href="funcop_1.html#T18">FUNCOP_1:18</a></i>;<br/>


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