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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="ordinal1.html#NM2">Ordinal</a>;<br/>

<i><font color="Green">E5</font></i>:  <a href="ordinal2.html#K2">inf</a> <font color="Maroon">c<sub>1</sub></font> = 
 <a href="setfam_1.html#K1">meet</a> <span class="p1">(<span class="default"><a href="ordinal1.html#K3">On</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="ordinal2.html#D6">ORDINAL2:def 6</a></i>
<br/>.= 
 <a href="setfam_1.html#K1">meet</a> <font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="ref" href="ordinal2.html#T10">ORDINAL2:10</a></i>
;<br/>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="9_2"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:9_2"/>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a> 
 ;<br/><a NAME="E2:9_2"/><b>then </b>
 <a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="ordinal3.html#T10" target="_self">Th10</a></i>;<br/><b>hence </b><a NAME="E3:9_2"/>
 <a href="ordinal2.html#K2">inf</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a> 
 <b>by </b><i><a class="txt" href="ordinal3.html#E1:9"><i><font color="Green">E5</font></i></a>, <a class="ref" href="setfam_1.html#T5">SETFAM_1:5</a></i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E3:9"/>
 <a href="ordinal2.html#K2">inf</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a> 
 <b>by </b><i><a class="txt" href="ordinal3.html#E1:9"><i><font color="Green">E5</font></i></a>, <a class="ref" href="setfam_1.html#D1">SETFAM_1:def 1</a></i>;<br/>


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