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<b>consider </b><font color="Maroon">IT</font> being  <a href="xboole_0.html#V1">empty</a> <a href="funct_1.html#NM1">Function</a>;<br/>
<b>take </b>
<font color="Maroon">IT</font>
;<br/>

<b>thus </b><a NAME="E2:1_1_1"/>
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">IT</font> <a href="tarski.html#R1">c=</a>  <a href="numbers.html#K5">NAT</a> 
 <b>by </b><i><a class="ref" href="xboole_1.html#T2">XBOOLE_1:2</a></i>;<br/>


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