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<b>take </b><font color="Maroon">F</font> =  <a href="vectsp_1.html#K3" target="_self">F_Real</a> ;<br/>

<b>let </b><font color="Maroon">a</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">F</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="vectsp_1.html#D28" target="_self">VECTSP_1:def 28</a><br/>

<b>assume </b><a NAME="E1:70_1_1"/><i><font color="Green">E46</font></i>: 
<font color="Maroon">a</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">a</font> <a href="hidden.html#R1">=</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">F</font>
 ;<br/>

<a NAME="E2:70_1_1"/>
<font color="Maroon">a</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="group_1.html#K2">1.</a> <font color="Maroon">F</font></span>)</span> <a href="group_1.html#K10">*</a> <font color="Maroon">a</font>
 
<b>by </b><i/>;<br/>
<a NAME="E3:70_1_1"/><b>then </b>
<font color="Maroon">a</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">a</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="group_1.html#K2">1.</a> <font color="Maroon">F</font></span>)</span> <a href="rlvect_1.html#K4">+</a> <span class="p2">(<span class="default"><a href="group_1.html#K2">1.</a> <font color="Maroon">F</font></span>)</span></span>)</span> <a href="group_1.html#K10">*</a> <font color="Maroon">a</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E4:70_1_1"/>
<font color="Maroon">a</font> <a href="hidden.html#R1">=</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">F</font>
 <b>by </b><i>, , </i>;<br/>


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