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<a NAME="E1:80_1_1"/>
 ex <font color="Olive">f</font> being  <a href="funct_1.html#NM1">Function</a> st <br/>(  <a href="relat_1.html#K1">dom</a> <font color="Olive">f</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">X</font> &amp;  <a href="relat_1.html#K2">rng</a> <font color="Olive">f</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">Y</font> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:80_1_1"/>
not  <a href="partfun1.html#K4" target="_self">PFuncs</a> <font color="Maroon">X</font>,<font color="Maroon">Y</font> is <a href="xboole_0.html#V1">empty</a>
 <b>by </b><i/>;<br/>


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