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<b>let </b><font color="Maroon" title="c9">l1</font>, <font color="Maroon" title="c10">l2</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c4">F</font>;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:26_1_2"/><i><font color="Green" title="E22">A3</font></i>: 
for <font color="Olive" title="b1">l</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c4">F</font>  st <font color="Maroon" title="c8">x</font> <a href="rlvect_1.html#K5" title="RLVECT_1:func.5">-</a> <span class="p1">(<span class="default"><font color="Olive" title="b1">l</font> <a href="vectsp_1.html#K5" title="VECTSP_1:func.5">*</a> <font color="Maroon" title="c7">b</font></span>)</span> <a href="symsp_1.html#R1" title="SYMSP_1:pred.1">_|_</a> <font color="Maroon" title="c6">a</font> holds <br/><font color="Maroon" title="c9">l1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">l</font>
 <b>and </b><br/><a NAME="E2:26_1_2"/><i><font color="Green" title="E23">A4</font></i>: 
for <font color="Olive" title="b1">l</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c4">F</font>  st <font color="Maroon" title="c8">x</font> <a href="rlvect_1.html#K5" title="RLVECT_1:func.5">-</a> <span class="p1">(<span class="default"><font color="Olive" title="b1">l</font> <a href="vectsp_1.html#K5" title="VECTSP_1:func.5">*</a> <font color="Maroon" title="c7">b</font></span>)</span> <a href="symsp_1.html#R1" title="SYMSP_1:pred.1">_|_</a> <font color="Maroon" title="c6">a</font> holds <br/><font color="Maroon" title="c10">l2</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">l</font>
 ;<br/>

<b>consider </b><font color="Maroon" title="c11">k</font> being   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c4">F</font><b> such that </b><br/><a NAME="E4:26_1_2"/><i><font color="Green" title="E24">A5</font></i>: 
<font color="Maroon" title="c8">x</font> <a href="rlvect_1.html#K5" title="RLVECT_1:func.5">-</a> <span class="p1">(<span class="default"><font color="Maroon" title="c11">k</font> <a href="vectsp_1.html#K5" title="VECTSP_1:func.5">*</a> <font color="Maroon" title="c7">b</font></span>)</span> <a href="symsp_1.html#R1" title="SYMSP_1:pred.1">_|_</a> <font color="Maroon" title="c6">a</font>
 <b>by </b><i><a class="txt" href="symsp_1.html#E1:26"><i><font color="Green" title="E21">A1</font></i></a>, <a class="ref" href="symsp_1.html#D2" target="_self" title="SYMSP_1:def.2">Def2</a></i>;<br/>
<a NAME="E5:26_1_2"/>
<font color="Maroon" title="c9">l1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c11">k</font>
 
<b>by </b><i><a class="txt" href="symsp_1.html#E1:26_1_2"><i><font color="Green" title="E22">A3</font></i></a>, <a class="txt" href="symsp_1.html#E4:26_1_2"><i><font color="Green" title="E24">A5</font></i></a></i>;<br/>
<b>hence </b><a NAME="E6:26_1_2"/>
<font color="Maroon" title="c9">l1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c10">l2</font>
 <b>by </b><i><a class="txt" href="symsp_1.html#E2:26_1_2"><i><font color="Green" title="E23">A4</font></i></a>, <a class="txt" href="symsp_1.html#E4:26_1_2"><i><font color="Green" title="E24">A5</font></i></a></i>;<br/>


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