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<b>let </b><font color="Maroon">l1</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">F</font>, <font color="Maroon">l2</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">F</font>;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:18_1_2"/><i><font color="Green">E27</font></i>: 
for <font color="Olive">l</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">F</font>  st <font color="Maroon">x</font> <a href="rlvect_1.html#K6">-</a> <span class="p1">(<span class="default"><font color="Olive">l</font> <a href="vectsp_1.html#K6">*</a> <font color="Maroon">b</font></span>)</span> <a href="symsp_1.html#R1">_|_</a> <font color="Maroon">a</font> holds <br/><font color="Maroon">l1</font> <a href="hidden.html#R1">=</a> <font color="Olive">l</font>
 <b>and </b><br/><a NAME="E2:18_1_2"/><i><font color="Green">E29</font></i>: 
for <font color="Olive">l</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">F</font>  st <font color="Maroon">x</font> <a href="rlvect_1.html#K6">-</a> <span class="p1">(<span class="default"><font color="Olive">l</font> <a href="vectsp_1.html#K6">*</a> <font color="Maroon">b</font></span>)</span> <a href="symsp_1.html#R1">_|_</a> <font color="Maroon">a</font> holds <br/><font color="Maroon">l2</font> <a href="hidden.html#R1">=</a> <font color="Olive">l</font>
 ;<br/>

<b>consider </b><font color="Maroon">k</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">F</font><b> such that </b><br/><a NAME="E4:18_1_2"/><i><font color="Green">E30</font></i>: 
<font color="Maroon">x</font> <a href="rlvect_1.html#K6">-</a> <span class="p1">(<span class="default"><font color="Maroon">k</font> <a href="vectsp_1.html#K6">*</a> <font color="Maroon">b</font></span>)</span> <a href="symsp_1.html#R1">_|_</a> <font color="Maroon">a</font>
 <b>by </b><i><a class="txt" href="ortsp_1.html#E5"><i><font color="Green">Lemma16</font></i></a>, </i>;<br/>
<a NAME="E5:18_1_2"/>
<font color="Maroon">l1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">k</font>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E6:18_1_2"/>
<font color="Maroon">l1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">l2</font>
 <b>by </b><i>, </i>;<br/>


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