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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="rlvect_1.html#NM2">RealLinearSpace</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font> be    <a href="rlsub_1.html#M1">Subspace</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>







<b>assume </b><a NAME="E1:24"/><i><font color="Green">E18</font></i>: 
<font color="Maroon">c<sub>2</sub></font> is    <a href="rlsub_1.html#M1">Subspace</a> of <font color="Maroon">c<sub>3</sub></font>
 ;<br/>

<a NAME="E2:24"/>
<font color="Maroon">c<sub>2</sub></font> <a href="rlsub_2.html#K2">/\</a> <font color="Maroon">c<sub>4</sub></font> is    <a href="rlsub_1.html#M1">Subspace</a> of <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="rlsub_2.html#T20">RLSUB_2:20</a></i>;<br/>
<b>hence </b><a NAME="E3:24"/>
<font color="Maroon">c<sub>2</sub></font> <a href="rlsub_2.html#K2">/\</a> <font color="Maroon">c<sub>4</sub></font> is    <a href="rlsub_1.html#M1">Subspace</a> of <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="rlvect_3.html#E1:24"><i><font color="Green">E18</font></i></a>, <a class="ref" href="rlsub_1.html#T35">RLSUB_1:35</a></i>;<br/>


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