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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/>

 <a href="partit1.html#K4" target="_self">ERl</a> <span class="p1">(<span class="default"><a href="partit1.html#K6" target="_self">%O</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> = 
 <a href="eqrel_1.html#K1">nabla</a> <font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="ref" href="partit1.html#T37" target="_self">Th37</a></i>
<br/>.= 
<span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>1</sub></font></span><a href="zfmisc_1.html#K2">:]</a></span>
<b>by </b><i><a class="ref" href="eqrel_1.html#D1">EQREL_1:def 1</a></i>
;<br/>
<a NAME="E2:47"/><b>then </b>
 <a href="partit1.html#K4" target="_self">ERl</a> <span class="p1">(<span class="default"><a href="partit1.html#NK6" target="_self">%I</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="tarski.html#R1">c=</a>  <a href="partit1.html#K4" target="_self">ERl</a> <span class="p1">(<span class="default"><a href="partit1.html#K6" target="_self">%O</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
 
;<br/>
<b>hence </b><a NAME="E3:47"/>
 <a href="partit1.html#NK6" target="_self">%I</a> <font color="Maroon">c<sub>1</sub></font> <a href="partit1.html#NR1" target="_self">'&lt;'</a>  <a href="partit1.html#K6" target="_self">%O</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="partit1.html#T24" target="_self">Th24</a></i>;<br/>


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