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<a NAME="E1:20_1_1"/>
(  <a href="relset_1.html#K4" title="RELSET_1:func.4">dom</a> <font color="Maroon" title="c4">f1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c1">C</font> &amp;  <a href="relset_1.html#K4" title="RELSET_1:func.4">dom</a> <font color="Maroon" title="c5">f2</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c1">C</font> )
 
<b>by </b><i><a class="ref" href="funct_2.html#D1" title="FUNCT_2:def.1">FUNCT_2:def 1</a></i>;<br/>
<b>then </b> <a href="relset_1.html#K4" title="RELSET_1:func.4">dom</a> <span class="p1">(<span class="default"><font color="Maroon" title="c4">f1</font> <a href="valued_1.html#K6" title="VALUED_1:func.6">+</a> <font color="Maroon" title="c5">f2</font></span>)</span> = 
<font color="Maroon" title="c1">C</font> <a href="xboole_0.html#K3" title="XBOOLE_0:func.3">/\</a> <font color="Maroon" title="c1">C</font>
<b>by </b><i><a class="ref" href="valued_1.html#D1" target="_self" title="VALUED_1:def.1">Def1</a></i>
<br/>.= 
<font color="Maroon" title="c1">C</font>

;<br/>
<b>hence </b><a NAME="E3:20_1_1"/>
<font color="Maroon" title="c4">f1</font> <a href="valued_1.html#K6" title="VALUED_1:func.6">+</a> <font color="Maroon" title="c5">f2</font> is  <a href="partfun1.html#V1" title="PARTFUN1:attr.1">total</a> <a href="partfun1.html#NM1" title="PARTFUN1:NM.1">PartFunc</a> of <font color="Maroon" title="c1">C</font>, <a href="numbers.html#K5" title="NUMBERS:func.5">NAT</a> 
 <b>by </b><i><a class="ref" href="partfun1.html#D4" title="PARTFUN1:def.4">PARTFUN1:def 4</a></i>;<br/>


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