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

<b>assume </b><a NAME="E1:55"/><i><font color="Green">E26</font></i>: 
<font color="Maroon">R</font> is <a href="struct_0.html#V3">empty</a>
 ;<br/>

<a NAME="E2:55"/><i><font color="Green">E29</font></i>: 
the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">R</font> is <a href="xboole_0.html#V1">empty</a>
 
<b>by </b><i>, <a class="ref" href="struct_0.html#D1">STRUCT_0:def 1</a></i>;<br/>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="55_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">N</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">R</font>;<br/><b>take </b><font color="Maroon">B</font> =  <a href="xboole_0.html#K1">{}</a> ;<br/><a NAME="E1:55_1"/>
<font color="Maroon">N</font> <a href="hidden.html#R1">=</a>  <a href="subset_1.html#K1">{}</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">R</font>
 <b>by </b><i>, <a class="ref" href="xboole_1.html#T3">XBOOLE_1:3</a></i>;<br/><b>hence </b><a NAME="E2:55_1"/>
<font color="Maroon">B</font> <a href="dickson.html#R1" target="_self">is_Dickson-basis_of</a> <font color="Maroon">N</font>,<font color="Maroon">R</font>
 <b>by </b><i/>;<br/><b>thus </b><a NAME="E3:55_1"/>
<font color="Maroon">B</font> is <a href="finset_1.html#V1">finite</a>
 ;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E4:55"/>
<font color="Maroon">R</font> is <a href="dickson.html#V4" target="_self">Dickson</a>
 <b>by </b><i><a class="txt" href="dickson.html#E1:55"><i><font color="Green">E26</font></i></a></i>;<br/>


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