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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="subset_1.html#M1">Element</a> of <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><a href="xboole_0.html#K1">{}</a> </span><a href="tarski.html#K1">}</a></span>; <i><font color="Red">:: according to </font></i><a class="ref" href="oposet_1.html#D3" target="_self">OPOSET_1:def 3</a><br/>

<a NAME="E1:23"/>
<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="tarski.html#D1">TARSKI:def 1</a></i>;<br/>
<b>hence </b><a NAME="E2:23"/>
<a href="vectsp_2.html#K7">op1</a>  <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><a href="vectsp_2.html#K7">op1</a>  <a href="funct_2.html#K3">.</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="funct_2.html#T65">FUNCT_2:65</a></i>;<br/>


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