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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/>

<b>consider </b><font color="Maroon">c<sub>2</sub></font> being    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>
<a NAME="E2:9"/>
( <span class="p1">(<span class="default"><a href="cfuncdom.html#K4" target="_self">ComplexFuncZero</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="complex1.html#K5">0c</a>  &amp; <span class="p1">(<span class="default"><a href="cfuncdom.html#K5" target="_self">ComplexFuncUnit</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="complex1.html#K6">1r</a>  )
 
<b>by </b><i><a class="ref" href="cfuncdom.html#T3" target="_self">Th3</a>, <a class="ref" href="cfuncdom.html#T4" target="_self">Th4</a></i>;<br/>
<b>hence </b><a NAME="E3:9"/>
 <a href="cfuncdom.html#K4" target="_self">ComplexFuncZero</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="cfuncdom.html#K5" target="_self">ComplexFuncUnit</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="complex1.html#D7">COMPLEX1:def 7</a></i>;<br/>


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