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<b>let </b><font color="Maroon" title="c1">f</font>, <font color="Maroon" title="c2">g</font> be   <a href="funct_1.html#NM1" title="FUNCT_1:NM.1">Function</a>;<br/>

<b>assume </b><a NAME="E1:82"/><i><font color="Green" title="E47">A1</font></i>: 
<font color="Maroon" title="c1">f</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c2">g</font>
 ;<br/>

<a NAME="E2:82"/><b>then </b>
 <a href="relat_1.html#K1" title="RELAT_1:func.1">dom</a> <font color="Maroon" title="c1">f</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="relat_1.html#K1" title="RELAT_1:func.1">dom</a> <font color="Maroon" title="c2">g</font>
 
<b>by </b><i><a class="ref" href="grfunc_1.html#T8" title="GRFUNC_1:th.8">GRFUNC_1:8</a></i>;<br/>
<b>hence </b><a NAME="E3:82"/><i><font color="Green" title="E48">A2</font></i>: 
<font color="Maroon" title="c1">f</font> <a href="funct_4.html#K1" title="FUNCT_4:func.1">+*</a> <font color="Maroon" title="c2">g</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">g</font>
 <b>by </b><i><a class="ref" href="funct_4.html#T20" target="_self" title="FUNCT_4:th.20">Th20</a></i>;<br/>

<a NAME="E4:82"/>
<font color="Maroon" title="c1">f</font> <a href="partfun1.html#R1" title="PARTFUN1:pred.1">tolerates</a> <font color="Maroon" title="c2">g</font>
 
<b>by </b><i><a class="txt" href="funct_4.html#E1:82"><i><font color="Green" title="E47">A1</font></i></a>, <a class="ref" href="partfun1.html#T135" title="PARTFUN1:th.135">PARTFUN1:135</a></i>;<br/>
<b>hence </b><a NAME="E5:82"/>
<font color="Maroon" title="c2">g</font> <a href="funct_4.html#K1" title="FUNCT_4:func.1">+*</a> <font color="Maroon" title="c1">f</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">g</font>
 <b>by </b><i><a class="txt" href="funct_4.html#E3:82"><i><font color="Green" title="E48">A2</font></i></a>, <a class="ref" href="funct_4.html#T35" target="_self" title="FUNCT_4:th.35">Th35</a></i>;<br/>


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