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<b>let </b><font color="Maroon" title="c1">SAS</font> be   <a href="semi_af1.html#NM1" title="SEMI_AF1:NM.1">Semi_Affine_Space</a>;<br/><b>let </b><font color="Maroon" title="c2">a</font>, <font color="Maroon" title="c3">o</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">SAS</font>;<br/>





<a NAME="E1:79"/>
(  <a href="semi_af1.html#R3" title="SEMI_AF1:pred.3">congr</a> <font color="Maroon" title="c3">o</font>,<font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c3">o</font>, <a href="semi_af1.html#K1" title="SEMI_AF1:func.1">sum</a> <font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c3">o</font>,<font color="Maroon" title="c3">o</font> &amp;  <a href="semi_af1.html#R3" title="SEMI_AF1:pred.3">congr</a> <font color="Maroon" title="c3">o</font>,<font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c3">o</font>,<font color="Maroon" title="c2">a</font> )
 
<b>by </b><i><a class="ref" href="semi_af1.html#D5" target="_self" title="SEMI_AF1:def.5">Def5</a>, <a class="ref" href="semi_af1.html#T84" target="_self" title="SEMI_AF1:th.84">Th84</a></i>;<br/>
<b>hence </b><a NAME="E2:79"/>
 <a href="semi_af1.html#K1" title="SEMI_AF1:func.1">sum</a> <font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c3">o</font>,<font color="Maroon" title="c3">o</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">a</font>
 <b>by </b><i><a class="ref" href="semi_af1.html#T81" target="_self" title="SEMI_AF1:th.81">Th81</a></i>;<br/>


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