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<b>let </b><font color="Maroon">a</font> be   <a href="struct_0.html#NM1">Element</a> of <a href="algstr_1.html#K2" target="_self">L_Trivial</a> , <font color="Maroon">b</font> be   <a href="struct_0.html#NM1">Element</a> of <a href="algstr_1.html#K2" target="_self">L_Trivial</a> ;<br/>

<b>thus </b><font color="Maroon">a</font> = 
 <a href="xboole_0.html#K1">{}</a> 
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>
<br/>.= 
<font color="Maroon">b</font>
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>
;<br/>


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