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<b>let </b><font color="Maroon" title="c1">M</font> be   <a href="midsp_1.html#NM1" title="MIDSP_1:NM.1">MidSp</a>;<br/><b>let </b><font color="Maroon" title="c2">W</font>, <font color="Maroon" title="c3">W1</font>, <font color="Maroon" title="c4">W2</font> be    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="midsp_1.html#K12" title="MIDSP_1:func.12">setvect</a> <font color="Maroon" title="c1">M</font>;<br/>







<b>assume </b><b>that </b><br/><a NAME="E1:66"/><i><font color="Green" title="E48">A1</font></i>: 
<font color="Maroon" title="c2">W</font> <a href="midsp_1.html#K13" title="MIDSP_1:func.13">+</a> <font color="Maroon" title="c3">W1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="midsp_1.html#K8" title="MIDSP_1:func.8">ID</a> <font color="Maroon" title="c1">M</font>
 <b>and </b><br/><a NAME="E2:66"/><i><font color="Green" title="E49">A2</font></i>: 
<font color="Maroon" title="c2">W</font> <a href="midsp_1.html#K13" title="MIDSP_1:func.13">+</a> <font color="Maroon" title="c4">W2</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="midsp_1.html#K8" title="MIDSP_1:func.8">ID</a> <font color="Maroon" title="c1">M</font>
 ;<br/>

<b>reconsider </b><font color="Maroon" title="c5">x</font> = <font color="Maroon" title="c2">W</font>, <font color="Maroon" title="c6">y1</font> = <font color="Maroon" title="c3">W1</font>, <font color="Maroon" title="c7">y2</font> = <font color="Maroon" title="c4">W2</font> as    <a href="midsp_1.html#M1" title="MIDSP_1:mode.1">Vector</a> of <font color="Maroon" title="c1">M</font> <b>by </b><i><a class="ref" href="midsp_1.html#T71" target="_self" title="MIDSP_1:th.71">Th71</a></i>;<br/>
<font color="Maroon" title="c5">x</font> <a href="midsp_1.html#K9" title="MIDSP_1:func.9">+</a> <font color="Maroon" title="c6">y1</font> = 
<font color="Maroon" title="c2">W</font> <a href="midsp_1.html#K13" title="MIDSP_1:func.13">+</a> <font color="Maroon" title="c4">W2</font>
<b>by </b><i><a class="txt" href="midsp_1.html#E1:66"><i><font color="Green" title="E48">A1</font></i></a>, <a class="txt" href="midsp_1.html#E2:66"><i><font color="Green" title="E49">A2</font></i></a>, <a class="ref" href="midsp_1.html#D14" target="_self" title="MIDSP_1:def.14">Def14</a></i>
<br/>.= 
<font color="Maroon" title="c5">x</font> <a href="midsp_1.html#K9" title="MIDSP_1:func.9">+</a> <font color="Maroon" title="c7">y2</font>
<b>by </b><i><a class="ref" href="midsp_1.html#D14" target="_self" title="MIDSP_1:def.14">Def14</a></i>
;<br/>
<b>hence </b><a NAME="E5:66"/>
<font color="Maroon" title="c3">W1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c4">W2</font>
 <b>by </b><i><a class="ref" href="midsp_1.html#T67" target="_self" title="MIDSP_1:th.67">Th67</a></i>;<br/>


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