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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font> be    <a href="hidden.html#M1">set</a> ;<br/>



<a NAME="E1:10"/>
 <a href="classes1.html#K1" target="_self">Tarski-Class</a> <font color="Maroon">c<sub>2</sub></font> <a href="classes1.html#R1" target="_self">is_Tarski-Class_of</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="classes1.html#D4" target="_self">Def4</a></i>;<br/>
<a NAME="E2:10"/><b>then </b>
 <a href="classes1.html#K1" target="_self">Tarski-Class</a> <font color="Maroon">c<sub>2</sub></font> <a href="classes1.html#NR1" target="_self">is_Tarski-Class</a> 
 
<b>by </b><i><a class="ref" href="classes1.html#D3" target="_self">Def3</a></i>;<br/>
<b>hence </b><a NAME="E3:10"/>
( <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R2">in</a>  <a href="classes1.html#K1" target="_self">Tarski-Class</a> <font color="Maroon">c<sub>2</sub></font> implies  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R2">in</a>  <a href="classes1.html#K1" target="_self">Tarski-Class</a> <font color="Maroon">c<sub>2</sub></font> )
 <b>by </b><i><a class="ref" href="classes1.html#D2" target="_self">Def2</a></i>;<br/>


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