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<b>let </b><font color="Maroon" title="c1">A</font> be   <a href="unialg_1.html#NM2" title="UNIALG_1:NM.2">Universal_Algebra</a>;<br/>

<b>assume </b><a NAME="E1:51"/><i><font color="Green" title="E31">A1</font></i>: 
 <a href="unialg_2.html#K6" title="UNIALG_2:func.6">Constants</a> <font color="Maroon" title="c1">A</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> 
 ;<br/>

<b>let </b><font color="Maroon" title="c2">G</font> be    <a href="freealg.html#M1" title="FREEALG:mode.1">GeneratorSet</a> of <font color="Maroon" title="c1">A</font>;<br/>

<b>assume </b><a NAME="E2:51"/><i><font color="Green" title="E32">A2</font></i>: 
<font color="Maroon" title="c2">G</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> 
 ;<br/>

<a NAME="E3:51"/><b>then </b>
<font color="Maroon" title="c2">G</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="struct_0.html#K1" title="STRUCT_0:func.1">{}</a> <font color="Maroon" title="c1">A</font>
 
;<br/>
<a NAME="E4:51"/><b>then </b>
( <font color="Maroon" title="c2">G</font> is <a href="unialg_2.html#V1" title="UNIALG_2:attr.1">opers_closed</a> &amp; <font color="Maroon" title="c2">G</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c2">G</font> &amp; the <a href="struct_0.html#U1" title="STRUCT_0:sel.1">carrier</a> of <font color="Maroon" title="c1">A</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  )
 
<b>by </b><i><a class="txt" href="aofa_000.html#E1:51"><i><font color="Green" title="E31">A1</font></i></a>, <a class="ref" href="aofa_000.html#T28" target="_self" title="AOFA_000:th.28">Th28</a></i>;<br/>
<b>hence </b><a NAME="E5:51"/>
contradiction
 <b>by </b><i><a class="txt" href="aofa_000.html#E2:51"><i><font color="Green" title="E32">A2</font></i></a>, <a class="ref" href="freealg.html#D5" title="FREEALG:def.5">FREEALG:def 5</a></i>;<br/>


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