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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="afvect0.html#NM1">WeakAffVect</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>







<a NAME="E1:43"/>
 <a href="afvect0.html#R2" target="_self">Mid</a>  <a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font>, <a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>3</sub></font>,<span class="p1">(<span class="default"><a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font></span>)</span>
 
<b>by </b><i><a class="ref" href="afvect0.html#D4" target="_self">Def4</a></i>;<br/>
<a NAME="E2:43"/><b>then </b>
 <a href="afvect0.html#R2" target="_self">Mid</a>  <a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<span class="p1">(<span class="default"><a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font></span>)</span>, <a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font>, <a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<span class="p1">(<span class="default"><a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>3</sub></font>,<span class="p2">(<span class="default"><a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span>
 
<b>by </b><i><a class="ref" href="afvect0.html#T42" target="_self">Th42</a></i>;<br/>
<a NAME="E3:43"/><b>then </b>
 <a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<span class="p1">(<span class="default"><a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>3</sub></font>,<span class="p2">(<span class="default"><a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="afvect0.html#K1" target="_self">PSym</a> <span class="p1">(<span class="default"><a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font></span>)</span>,<span class="p1">(<span class="default"><a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<span class="p2">(<span class="default"><a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span>
 
<b>by </b><i><a class="ref" href="afvect0.html#D4" target="_self">Def4</a></i>;<br/>
<b>hence </b><a NAME="E4:43"/>
 <a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<span class="p1">(<span class="default"><a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>3</sub></font>,<span class="p2">(<span class="default"><a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="afvect0.html#K1" target="_self">PSym</a> <span class="p1">(<span class="default"><a href="afvect0.html#K1" target="_self">PSym</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font></span>)</span>,<font color="Maroon">c<sub>4</sub></font>
 <b>by </b><i><a class="ref" href="afvect0.html#T36" target="_self">Th36</a></i>;<br/>


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