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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="funct_1.html#NM1">Function</a>;<br/>

<a NAME="E1:17"/>
 <a href="xboole_0.html#K1">{}</a>  <a href="tarski.html#R1">c=</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T2">XBOOLE_1:2</a></i>;<br/>
<b>hence </b><a href="xboole_0.html#K1">{}</a>  <a href="algspec1.html#K1" target="_self">-indexing</a> <font color="Maroon">c<sub>1</sub></font> = 
<font color="Maroon">c<sub>1</sub></font> <a href="relat_1.html#K7">|</a> <a href="xboole_0.html#K1">{}</a> 
<b>by </b><i><a class="ref" href="algspec1.html#T16" target="_self">Th16</a></i>
<br/>.= 
 <a href="xboole_0.html#K1">{}</a> 
<b>by </b><i><a class="ref" href="relat_1.html#T110">RELAT_1:110</a></i>
;<br/><br/>


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