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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/><b>let </b><font color="Maroon">c<sub>3</sub></font> be    <a href="relset_1.html#M2">Relation</a> of <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font>;<br/>





<b>thus </b> <a href="funct_5.html#K1">proj1</a> <font color="Maroon">c<sub>3</sub></font> = 
 <a href="relset_1.html#K4">dom</a> <font color="Maroon">c<sub>3</sub></font>
<b>by </b><i><a class="ref" href="funct_5.html#T21">FUNCT_5:21</a></i>
<br/>.= 
 <a href="relset_1.html#K5">rng</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="relset_1.html#K6">~</a> </span>)</span>
<b>by </b><i><a class="ref" href="relat_1.html#T37">RELAT_1:37</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="relset_1.html#K6">~</a> </span>)</span> <a href="relset_1.html#K10">.:</a> <font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="ref" href="relset_1.html#T38">RELSET_1:38</a></i>
;<br/>

<b>thus </b> <a href="funct_5.html#K2">proj2</a> <font color="Maroon">c<sub>3</sub></font> = 
 <a href="relset_1.html#K5">rng</a> <font color="Maroon">c<sub>3</sub></font>
<b>by </b><i><a class="ref" href="funct_5.html#T21">FUNCT_5:21</a></i>
<br/>.= 
<font color="Maroon">c<sub>3</sub></font> <a href="relset_1.html#K10">.:</a> <font color="Maroon">c<sub>2</sub></font>
<b>by </b><i><a class="ref" href="relset_1.html#T38">RELSET_1:38</a></i>
;<br/>


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