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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="orders_2.html#L1">RelStr</a> ;<br/>

<b>assume </b><a NAME="E1:5"/><i><font color="Green">E4</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="struct_0.html#V3">empty</a>
 ;<br/>

<a NAME="E2:5"/><b>then </b><i><font color="Green">E5</font></i>: 
the <a href="struct_0.html#U1">carrier</a> of <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="ref" href="struct_0.html#D1">STRUCT_0:def 1</a></i>;<br/>
<a NAME="E3:5"/>
the <a href="orders_2.html#U1">InternalRel</a> of <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="orders_3.html#E1:5"><i><font color="Green">E4</font></i></a>, <a class="txt" href="orders_3.html#E2"><i><font color="Green">Lemma2</font></i></a></i>;<br/>
<b>hence </b><a NAME="E4:5"/>
<font color="Maroon">c<sub>1</sub></font> is <a href="orders_3.html#V1" target="_self">discrete</a>
 <b>by </b><i><a class="txt" href="orders_3.html#E2:5"><i><font color="Green">E5</font></i></a>, <a class="ref" href="orders_3.html#D1" target="_self">Def1</a>, <a class="ref" href="relat_1.html#T81">RELAT_1:81</a></i>;<br/>


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