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<b>let </b><font color="Maroon">V</font> be   <a href="rlvect_1.html#NM2">RealLinearSpace</a>;<br/><b>let </b><font color="Maroon">w1</font> be   <a href="rlvect_1.html#NM1">VECTOR</a> of <font color="Maroon">V</font>;<br/><b>let </b><font color="Maroon">w2</font> be   <a href="rlvect_1.html#NM1">VECTOR</a> of <font color="Maroon">V</font>;<br/>





<a NAME="E1:16"/>
( <font color="Maroon">w1</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="domain_1.html#K7">{</a><span class="default"><font color="Maroon">w1</font>,<font color="Maroon">w2</font></span><a href="domain_1.html#K7">}</a></span> &amp; <font color="Maroon">w2</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="domain_1.html#K7">{</a><span class="default"><font color="Maroon">w1</font>,<font color="Maroon">w2</font></span><a href="domain_1.html#K7">}</a></span> )
 
<b>by </b><i><a class="ref" href="tarski.html#D2">TARSKI:def 2</a></i>;<br/>
<b>hence </b><a NAME="E2:16"/>
( <font color="Maroon">w1</font> <a href="rlvect_1.html#R1">in</a>  <a href="rlvect_3.html#K1">Lin</a> <span class="p1"><a href="domain_1.html#K7">{</a><span class="default"><font color="Maroon">w1</font>,<font color="Maroon">w2</font></span><a href="domain_1.html#K7">}</a></span> &amp; <font color="Maroon">w2</font> <a href="rlvect_1.html#R1">in</a>  <a href="rlvect_3.html#K1">Lin</a> <span class="p1"><a href="domain_1.html#K7">{</a><span class="default"><font color="Maroon">w1</font>,<font color="Maroon">w2</font></span><a href="domain_1.html#K7">}</a></span> )
 <b>by </b><i><a class="ref" href="rlvect_3.html#T18">RLVECT_3:18</a></i>;<br/>


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