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<b>set </b><font color="Maroon">c<sub>3</sub></font> =  <a href="grcat_1.html#K12" target="_self">ZERO</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font>;<br/>
<a NAME="E1:32_1_1"/>
 <a href="grcat_1.html#K11" target="_self">fun</a> <span class="p1">(<span class="default"><a href="grcat_1.html#K12" target="_self">ZERO</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span>)</span> is <a href="grcat_1.html#V1" target="_self">additive</a>
 
<b>by </b><i><a class="ref" href="grcat_1.html#T16" target="_self">Th16</a></i>;<br/>
<b>hence </b><a NAME="E2:32_1_1"/>
 <a href="grcat_1.html#K12" target="_self">ZERO</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font> is <a href="grcat_1.html#V3" target="_self">GroupMorphism-like</a>
 <b>by </b><i><a class="ref" href="grcat_1.html#D18" target="_self">Def18</a></i>;<br/>


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