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<b>let </b><font color="Maroon" title="c1">k</font> be    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="numbers.html#K5" title="NUMBERS:func.5">NAT</a> ;<br/><b>let </b><font color="Maroon" title="c2">X</font> be  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>



<b>assume </b><a NAME="E1:46"/><i><font color="Green" title="E36">A1</font></i>: 
(  <a href="numbers.html#K6" title="NUMBERS:func.6">0</a>  <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;</a> <font color="Maroon" title="c1">k</font> &amp; <font color="Maroon" title="c1">k</font> <a href="nat_1.html#K2" title="NAT_1:func.2">+</a> 1 <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a>  <a href="card_1.html#K1" title="CARD_1:func.1">Card</a> <font color="Maroon" title="c2">X</font> )
 ;<br/>

<b>let </b><font color="Maroon" title="c3">A</font> be  <a href="finset_1.html#V1" title="FINSET_1:attr.1">finite</a> <a href="subset_1.html#NM2" title="SUBSET_1:NM.2">Subset</a> of <font color="Maroon" title="c2">X</font>;<br/>

<b>assume </b><a NAME="E2:46"/><i><font color="Green" title="E37">A2</font></i>: 
 <a href="card_1.html#K1" title="CARD_1:func.1">Card</a> <font color="Maroon" title="c3">A</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c1">k</font> <a href="real_1.html#K5" title="REAL_1:func.5">-</a> 1
 ;<br/>

<a NAME="E3:46"/>
 <a href="combgras.html#K7" title="COMBGRAS:func.7">^^</a> <font color="Maroon" title="c3">A</font>,<font color="Maroon" title="c2">X</font>,<font color="Maroon" title="c1">k</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="combgras.html#K6" title="COMBGRAS:func.6">^^</a> <font color="Maroon" title="c3">A</font>,<font color="Maroon" title="c2">X</font>
 
<b>by </b><i><a class="txt" href="combgras.html#E1:46"><i><font color="Green" title="E36">A1</font></i></a>, <a class="txt" href="combgras.html#E2:46"><i><font color="Green" title="E37">A2</font></i></a>, <a class="ref" href="combgras.html#D13" target="_self" title="COMBGRAS:def.13">Def13</a></i>;<br/>
<b>hence </b><a NAME="E4:46"/>
 <a href="setfam_1.html#K1" title="SETFAM_1:func.1">meet</a> <span class="p1">(<span class="default"><a href="combgras.html#K7" title="COMBGRAS:func.7">^^</a> <font color="Maroon" title="c3">A</font>,<font color="Maroon" title="c2">X</font>,<font color="Maroon" title="c1">k</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">A</font>
 <b>by </b><i><a class="txt" href="combgras.html#E1:46"><i><font color="Green" title="E36">A1</font></i></a>, <a class="txt" href="combgras.html#E2:46"><i><font color="Green" title="E37">A2</font></i></a>, <a class="ref" href="combgras.html#T26" target="_self" title="COMBGRAS:th.26">Th26</a></i>;<br/>


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