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<b>let </b><font color="Maroon" title="c1">Y</font>, <font color="Maroon" title="c2">X</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>



<a NAME="E1:11"/>
 <a href="classes1.html#K1" title="CLASSES1:func.1">Tarski-Class</a> <font color="Maroon" title="c2">X</font> <a href="classes1.html#R1" title="CLASSES1:pred.1">is_Tarski-Class_of</a> <font color="Maroon" title="c2">X</font>
 
<b>by </b><i><a class="ref" href="classes1.html#D4" target="_self" title="CLASSES1:def.4">Def4</a></i>;<br/>
<a NAME="E2:11"/><b>then </b>
 <a href="classes1.html#K1" title="CLASSES1:func.1">Tarski-Class</a> <font color="Maroon" title="c2">X</font> <a href="classes1.html#NR1" title="CLASSES1:NR.1">is_Tarski-Class</a> 
 
<b>by </b><i><a class="ref" href="classes1.html#D3" target="_self" title="CLASSES1:def.3">Def3</a></i>;<br/>
<b>hence </b><a NAME="E3:11"/>
(  not <font color="Maroon" title="c1">Y</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="classes1.html#K1" title="CLASSES1:func.1">Tarski-Class</a> <font color="Maroon" title="c2">X</font> or <font color="Maroon" title="c1">Y</font>, <a href="classes1.html#K1" title="CLASSES1:func.1">Tarski-Class</a> <font color="Maroon" title="c2">X</font> <a href="tarski.html#R2" title="TARSKI:pred.2">are_equipotent</a>  or <font color="Maroon" title="c1">Y</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="classes1.html#K1" title="CLASSES1:func.1">Tarski-Class</a> <font color="Maroon" title="c2">X</font> )
 <b>by </b><i><a class="ref" href="classes1.html#D2" target="_self" title="CLASSES1:def.2">Def2</a></i>;<br/>


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