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<b>let </b><font color="Maroon">V</font> be   <a href="bhsp_1.html#NM1">RealUnitarySpace</a>;<br/><b>let </b><font color="Maroon">W1</font> be    <a href="rusub_1.html#M1">Subspace</a> of <font color="Maroon">V</font>, <font color="Maroon">W2</font> be    <a href="rusub_1.html#M1">Subspace</a> of <font color="Maroon">V</font>;<br/>



<b>assume </b><a NAME="E1:64"/><i><font color="Green">E20</font></i>: 
<font color="Maroon">V</font> <a href="hidden.html#R1">=</a> <font color="Maroon">W1</font> <a href="rusub_2.html#K1" target="_self">+</a> <font color="Maroon">W2</font>
 ;<br/>

<b>given </b><font color="Maroon">v</font> being   <a href="rlvect_1.html#NM1">VECTOR</a> of <font color="Maroon">V</font><b> such that </b><a NAME="E2:64"/><i><font color="Green">E23</font></i>: 
for <font color="Olive">v1</font>, <font color="Olive">v2</font>, <font color="Olive">u1</font>, <font color="Olive">u2</font> being  <a href="rlvect_1.html#NM1">VECTOR</a> of <font color="Maroon">V</font>  st <font color="Maroon">v</font> <a href="hidden.html#R1">=</a> <font color="Olive">v1</font> <a href="rlvect_1.html#K4">+</a> <font color="Olive">v2</font> &amp; <font color="Maroon">v</font> <a href="hidden.html#R1">=</a> <font color="Olive">u1</font> <a href="rlvect_1.html#K4">+</a> <font color="Olive">u2</font> &amp; <font color="Olive">v1</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W1</font> &amp; <font color="Olive">u1</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W1</font> &amp; <font color="Olive">v2</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W2</font> &amp; <font color="Olive">u2</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W2</font> holds <br/>( <font color="Olive">v1</font> <a href="hidden.html#R1">=</a> <font color="Olive">u1</font> &amp; <font color="Olive">v2</font> <a href="hidden.html#R1">=</a> <font color="Olive">u2</font> )
 ;<br/>

<a NAME="E3:64"/><i><font color="Green">E24</font></i>: 
the <a href="struct_0.html#U1">carrier</a> of <span class="p1">(<span class="default"><a href="rusub_1.html#K1">(0).</a> <font color="Maroon">V</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <font color="Maroon">V</font></span>)</span></span><a href="domain_1.html#K6">}</a></span>
 
<b>by </b><i><a class="ref" href="rusub_1.html#D2">RUSUB_1:def 2</a></i>;<br/>
<b>assume </b><a NAME="E4:64"/>
not <font color="Maroon">V</font> <a href="rusub_2.html#R1" target="_self">is_the_direct_sum_of</a> <font color="Maroon">W1</font>,<font color="Maroon">W2</font>
 ;<br/>

<a NAME="E5:64"/><b>then </b>
<font color="Maroon">W1</font> <a href="rusub_2.html#K2" target="_self">/\</a> <font color="Maroon">W2</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="rusub_1.html#K1">(0).</a> <font color="Maroon">V</font>
 
<b>by </b><i><a class="txt" href="rusub_2.html#E14:64"><i><font color="Green">E49</font></i></a>, <a class="ref" href="rusub_2.html#T2" target="_self">Th2</a></i>;<br/>
<a NAME="E6:64"/><b>then </b>
( the <a href="struct_0.html#U1">carrier</a> of <span class="p1">(<span class="default"><font color="Maroon">W1</font> <a href="rusub_2.html#K2" target="_self">/\</a> <font color="Maroon">W2</font></span>)</span> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> the <a href="struct_0.html#U1">carrier</a> of <span class="p1">(<span class="default"><a href="rusub_1.html#K1">(0).</a> <font color="Maroon">V</font></span>)</span> &amp;  <a href="rusub_1.html#K1">(0).</a> <font color="Maroon">V</font> is    <a href="rusub_1.html#M1">Subspace</a> of <font color="Maroon">W1</font> <a href="rusub_2.html#K2" target="_self">/\</a> <font color="Maroon">W2</font> )
 
<b>by </b><i><a class="ref" href="rusub_1.html#T24">RUSUB_1:24</a>, <a class="ref" href="rusub_1.html#T33">RUSUB_1:33</a></i>;<br/>
<a NAME="E7:64"/><b>then </b>
( the <a href="struct_0.html#U1">carrier</a> of <span class="p1">(<span class="default"><font color="Maroon">W1</font> <a href="rusub_2.html#K2" target="_self">/\</a> <font color="Maroon">W2</font></span>)</span> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <font color="Maroon">V</font></span>)</span></span><a href="domain_1.html#K6">}</a></span> &amp; <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <font color="Maroon">V</font></span>)</span></span><a href="domain_1.html#K6">}</a></span> <a href="tarski.html#R1">c=</a> the <a href="struct_0.html#U1">carrier</a> of <span class="p1">(<span class="default"><font color="Maroon">W1</font> <a href="rusub_2.html#K2" target="_self">/\</a> <font color="Maroon">W2</font></span>)</span> )
 
<b>by </b><i><a class="txt" href="rusub_2.html#E19:64"><i><font color="Green">E51</font></i></a>, <a class="ref" href="rusub_1.html#D1">RUSUB_1:def 1</a></i>;<br/>
<a NAME="E8:64"/><b>then </b>
<span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <font color="Maroon">V</font></span>)</span></span><a href="domain_1.html#K6">}</a></span> <a href="xboole_0.html#R2">c&lt;</a> the <a href="struct_0.html#U1">carrier</a> of <span class="p1">(<span class="default"><font color="Maroon">W1</font> <a href="rusub_2.html#K2" target="_self">/\</a> <font color="Maroon">W2</font></span>)</span>
 
<b>by </b><i><a class="ref" href="xboole_0.html#D8">XBOOLE_0:def 8</a></i>;<br/>
<b>then consider </b><font color="Maroon">x</font> being    <a href="hidden.html#M1">set</a> <b> such that </b><br/><a NAME="E10:64"/><i><font color="Green">E25</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> the <a href="struct_0.html#U1">carrier</a> of <span class="p1">(<span class="default"><font color="Maroon">W1</font> <a href="rusub_2.html#K2" target="_self">/\</a> <font color="Maroon">W2</font></span>)</span>
 <b>and </b><br/><a NAME="E11:64"/><i><font color="Green">E26</font></i>: 
not <font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <font color="Maroon">V</font></span>)</span></span><a href="domain_1.html#K6">}</a></span>
 <b>by </b><i><a class="ref" href="rlsub_2.html#T77">RLSUB_2:77</a></i>;<br/>
<a NAME="E12:64"/><i><font color="Green">E27</font></i>: 
<font color="Maroon">x</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W1</font> <a href="rusub_2.html#K2" target="_self">/\</a> <font color="Maroon">W2</font>
 
<b>by </b><i><a class="txt" href="rusub_2.html#E20:64"><i><font color="Green">E52</font></i></a>, <a class="ref" href="rlvect_1.html#D1">RLVECT_1:def 1</a></i>;<br/>
<a NAME="E13:64"/><b>then </b><i><font color="Green">E48</font></i>: 
( <font color="Maroon">x</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W1</font> &amp; <font color="Maroon">x</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W2</font> )
 
<b>by </b><i/>;<br/>
<a NAME="E14:64"/><i><font color="Green">E49</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">V</font>
 
<b>by </b><i>, <a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>;<br/>
<a NAME="E15:64"/>
<font color="Maroon">x</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">V</font>
 
<b>by </b><i>, <a class="ref" href="rusub_1.html#T2">RUSUB_1:2</a></i>;<br/>
<b>then reconsider </b><font color="Maroon">u</font> = <font color="Maroon">x</font> as   <a href="rlvect_1.html#NM1">VECTOR</a> of <font color="Maroon">V</font> <b>by </b><i><a class="ref" href="rlvect_1.html#D1">RLVECT_1:def 1</a></i>;<br/>
<b>consider </b><font color="Maroon">v1</font> being   <a href="rlvect_1.html#NM1">VECTOR</a> of <font color="Maroon">V</font>, <font color="Maroon">v2</font> being   <a href="rlvect_1.html#NM1">VECTOR</a> of <font color="Maroon">V</font><b> such that </b><br/><a NAME="E18:64"/><i><font color="Green">E50</font></i>: 
( <font color="Maroon">v1</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W1</font> &amp; <font color="Maroon">v2</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W2</font> )
 <b>and </b><br/><a NAME="E19:64"/><i><font color="Green">E51</font></i>: 
<font color="Maroon">v</font> <a href="hidden.html#R1">=</a> <font color="Maroon">v1</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">v2</font>
 <b>by </b><i><a class="txt" href="rusub_2.html#E14:64"><i><font color="Green">E49</font></i></a>, <a class="txt" href="rusub_2.html#E6"><i><font color="Green">Lemma36</font></i></a></i>;<br/>
<i><font color="Green">E52</font></i>: <font color="Maroon">v</font> = 
<span class="p1">(<span class="default"><font color="Maroon">v1</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">v2</font></span>)</span> <a href="rlvect_1.html#K4">+</a> <span class="p1">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <font color="Maroon">V</font></span>)</span>
<b>by </b><i><a class="ref" href="rusub_2.html#T7" target="_self">Th7</a>, <a class="ref" href="rlvect_1.html#T10">RLVECT_1:10</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">v1</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">v2</font></span>)</span> <a href="rlvect_1.html#K4">+</a> <span class="p1">(<span class="default"><font color="Maroon">u</font> <a href="rlvect_1.html#K6">-</a> <font color="Maroon">u</font></span>)</span>
<b>by </b><i><a class="ref" href="rlvect_1.html#T28">RLVECT_1:28</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">v1</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">v2</font></span>)</span> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">u</font></span>)</span> <a href="rlvect_1.html#K6">-</a> <font color="Maroon">u</font>
<b>by </b><i><a class="ref" href="rlvect_1.html#D6">RLVECT_1:def 6</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">v1</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">u</font></span>)</span> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">v2</font></span>)</span> <a href="rlvect_1.html#K6">-</a> <font color="Maroon">u</font>
<b>by </b><i><a class="ref" href="rlvect_1.html#D6">RLVECT_1:def 6</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">v1</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">u</font></span>)</span> <a href="rlvect_1.html#K4">+</a> <span class="p1">(<span class="default"><font color="Maroon">v2</font> <a href="rlvect_1.html#K6">-</a> <font color="Maroon">u</font></span>)</span>
<b>by </b><i><a class="ref" href="rlvect_1.html#D6">RLVECT_1:def 6</a></i>
;<br/>
<a NAME="E21:64"/>
( <font color="Maroon">v1</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">u</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W1</font> &amp; <font color="Maroon">v2</font> <a href="rlvect_1.html#K6">-</a> <font color="Maroon">u</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W2</font> )
 
<b>by </b><i>, , <a class="ref" href="rusub_1.html#T14">RUSUB_1:14</a>, <a class="ref" href="rusub_1.html#T17">RUSUB_1:17</a></i>;<br/>
<b>then </b><font color="Maroon">v2</font> <a href="rlvect_1.html#K6">-</a> <font color="Maroon">u</font> = 
<font color="Maroon">v2</font>
<b>by </b><i><a class="txt" href="rusub_2.html#E18:64"><i><font color="Green">E50</font></i></a>, , <a class="ref" href="rusub_2.html#T7" target="_self">Th7</a>, <a class="ref" href="rusub_2.html#T8" target="_self">Th8</a></i>
<br/>.= 
<font color="Maroon">v2</font> <a href="rlvect_1.html#K6">-</a> <span class="p1">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <font color="Maroon">V</font></span>)</span>
<b>by </b><i><a class="ref" href="rlvect_1.html#T26">RLVECT_1:26</a></i>
;<br/>
<b>hence </b><a NAME="E23:64"/>
contradiction
 <b>by </b><i>, <a class="ref" href="rlvect_1.html#T37">RLVECT_1:37</a></i>;<br/>


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