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<b>let </b><font color="Maroon" title="c4">W1</font>, <font color="Maroon" title="c5">W2</font> be    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="midsp_1.html#K13" title="MIDSP_1:func.13">setvect</a> <font color="Maroon" title="c1">M</font>;<br/>



<b>assume </b><b>that </b><br/><a NAME="E1:63_1_2"/><i><font color="Green" title="E45">A1</font></i>: 
for <font color="Olive" title="b1">u</font>, <font color="Olive" title="b2">v</font> being   <a href="midsp_1.html#M1" title="MIDSP_1:mode.1">Vector</a> of <font color="Maroon" title="c1">M</font>  st <font color="Maroon" title="c2">u1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">u</font> &amp; <font color="Maroon" title="c3">v1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b2">v</font> holds <br/><font color="Maroon" title="c4">W1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">u</font> <a href="midsp_1.html#K10" title="MIDSP_1:func.10">+</a> <font color="Olive" title="b2">v</font>
 <b>and </b><br/><a NAME="E2:63_1_2"/><i><font color="Green" title="E46">A2</font></i>: 
for <font color="Olive" title="b1">u</font>, <font color="Olive" title="b2">v</font> being   <a href="midsp_1.html#M1" title="MIDSP_1:mode.1">Vector</a> of <font color="Maroon" title="c1">M</font>  st <font color="Maroon" title="c2">u1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">u</font> &amp; <font color="Maroon" title="c3">v1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b2">v</font> holds <br/><font color="Maroon" title="c5">W2</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">u</font> <a href="midsp_1.html#K10" title="MIDSP_1:func.10">+</a> <font color="Olive" title="b2">v</font>
 ;<br/>

<b>reconsider </b><font color="Maroon" title="c6">u</font> = <font color="Maroon" title="c2">u1</font>, <font color="Maroon" title="c7">v</font> = <font color="Maroon" title="c3">v1</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/>
<a NAME="E4:63_1_2"/>
( <font color="Maroon" title="c4">W1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c6">u</font> <a href="midsp_1.html#K10" title="MIDSP_1:func.10">+</a> <font color="Maroon" title="c7">v</font> &amp; <font color="Maroon" title="c5">W2</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c6">u</font> <a href="midsp_1.html#K10" title="MIDSP_1:func.10">+</a> <font color="Maroon" title="c7">v</font> )
 
<b>by </b><i><a class="txt" href="midsp_1.html#E1:63_1_2"><i><font color="Green" title="E45">A1</font></i></a>, <a class="txt" href="midsp_1.html#E2:63_1_2"><i><font color="Green" title="E46">A2</font></i></a></i>;<br/>
<b>hence </b><a NAME="E5:63_1_2"/>
<font color="Maroon" title="c4">W1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c5">W2</font>
 ;<br/>


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