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<b>let </b><font color="Maroon">GF</font> be  non <a href="struct_0.html#V3">empty</a> <a href="rlvect_1.html#V3">Abelian</a> <a href="rlvect_1.html#V4">add-associative</a> <a href="rlvect_1.html#V5">right_zeroed</a> <a href="rlvect_1.html#V6">right_complementable</a> <a href="group_1.html#V4">associative</a> <a href="vectsp_1.html#V7">distributive</a> <a href="vectsp_1.html#V8">left_unital</a>  <a href="vectsp_1.html#L3">doubleLoopStr</a> ;<br/><b>let </b><font color="Maroon">M</font> be  non <a href="struct_0.html#V3">empty</a> <a href="rlvect_1.html#V3">Abelian</a> <a href="rlvect_1.html#V4">add-associative</a> <a href="rlvect_1.html#V5">right_zeroed</a> <a href="rlvect_1.html#V6">right_complementable</a> <a href="vectsp_1.html#V12">VectSp-like</a>  <a href="vectsp_1.html#L4">VectSpStr</a> of <font color="Maroon">GF</font>;<br/><b>let </b><font color="Maroon">W1</font> be    <a href="vectsp_4.html#M1">Subspace</a> of <font color="Maroon">M</font>;<br/><b>let </b><font color="Maroon">W2</font> be    <a href="vectsp_4.html#M1">Subspace</a> of <font color="Maroon">M</font>;<br/><b>let </b><font color="Maroon">C1</font> be    <a href="vectsp_4.html#M2">Coset</a> of <font color="Maroon">W1</font>;<br/><b>let </b><font color="Maroon">C2</font> be    <a href="vectsp_4.html#M2">Coset</a> of <font color="Maroon">W2</font>;<br/>











<b>assume </b><a NAME="E1:62"/><i><font color="Green">E29</font></i>: 
<font color="Maroon">C1</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">C2</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a> 
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="xboole_0.html#D7">XBOOLE_0:def 7</a><br/>

<b>consider </b><font color="Maroon">v</font> being    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">C1</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">C2</font>;<br/>
<b>reconsider </b><font color="Maroon">v</font> = <font color="Maroon">v</font> as   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font> <b>by </b><i><a class="ref" href="vectsp_5.html#T6" target="_self">Th6</a>, <a class="ref" href="tarski.html#D3">TARSKI:def 3</a></i>;<br/>
<b>set </b><font color="Maroon">C</font> = <font color="Maroon">C1</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">C2</font>;<br/>
<a NAME="E4:62"/>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <font color="Maroon">C1</font>
 
<b>by </b><i><a class="ref" href="vectsp_5.html#T6" target="_self">Th6</a>, <a class="ref" href="xboole_0.html#D3">XBOOLE_0:def 3</a></i>;<br/>
<a NAME="E5:62"/><b>then </b><i><font color="Green">E32</font></i>: 
<font color="Maroon">C1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">v</font> <a href="vectsp_4.html#K3">+</a> <font color="Maroon">W1</font>
 
<b>by </b><i><a class="ref" href="vectsp_4.html#T93">VECTSP_4:93</a></i>;<br/>
<a NAME="E6:62"/>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <font color="Maroon">C2</font>
 
<b>by </b><i><a class="ref" href="vectsp_5.html#T6" target="_self">Th6</a>, <a class="ref" href="xboole_0.html#D3">XBOOLE_0:def 3</a></i>;<br/>
<a NAME="E7:62"/><b>then </b><i><font color="Green">E33</font></i>: 
<font color="Maroon">C2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">v</font> <a href="vectsp_4.html#K3">+</a> <font color="Maroon">W2</font>
 
<b>by </b><i><a class="ref" href="vectsp_4.html#T93">VECTSP_4:93</a></i>;<br/>
<a NAME="E8:62"/>
<font color="Maroon">C1</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">C2</font> is    <a href="vectsp_4.html#M2">Coset</a> of <font color="Maroon">W1</font> <a href="vectsp_5.html#K2" target="_self">/\</a> <font color="Maroon">W2</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="62_1"><b>proof </b></a><div class="add">

<b>take </b>
<font color="Maroon">v</font>
; <i><font color="Red">:: according to </font></i><a class="ref" href="vectsp_4.html#D6">VECTSP_4:def 6</a><br/>

<b>thus </b><a NAME="E1:62_1"/>
<font color="Maroon">C1</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">C2</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">v</font> <a href="vectsp_4.html#K3">+</a> <span class="p1">(<span class="default"><font color="Maroon">W1</font> <a href="vectsp_5.html#K2" target="_self">/\</a> <font color="Maroon">W2</font></span>)</span>
  <i><font color="Red">:: according to </font></i><a class="ref" href="xboole_0.html#D10">XBOOLE_0:def 10</a><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="62_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:62_1_1"/><i><font color="Green">E34</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">C1</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">C2</font>
 ;<br/>

<a NAME="E2:62_1_1"/><b>then </b>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">C1</font>
 
<b>by </b><i><a class="ref" href="xboole_0.html#D3">XBOOLE_0:def 3</a></i>;<br/>
<b>then consider </b><font color="Maroon">u1</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font><b> such that </b><br/><a NAME="E4:62_1_1"/><i><font color="Green">E35</font></i>: 
<font color="Maroon">u1</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W1</font>
 <b>and </b><br/><a NAME="E5:62_1_1"/><i><font color="Green">E36</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">v</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">u1</font>
 <b>by </b><i><a class="ref" href="vectsp_5.html#T7" target="_self">Th7</a>, <a class="ref" href="vectsp_4.html#T57">VECTSP_4:57</a></i>;<br/>
<a NAME="E6:62_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">C2</font>
 
<b>by </b><i><a class="txt" href="vectsp_5.html#E12"><i><font color="Green">Lemma49</font></i></a>, <a class="ref" href="xboole_0.html#D3">XBOOLE_0:def 3</a></i>;<br/>
<b>then consider </b><font color="Maroon">u2</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font><b> such that </b><br/><a NAME="E8:62_1_1"/><i><font color="Green">E53</font></i>: 
<font color="Maroon">u2</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W2</font>
 <b>and </b><br/><a NAME="E9:62_1_1"/><i><font color="Green">E54</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">v</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">u2</font>
 <b>by </b><i><a class="txt" href="vectsp_5.html#E11"><i><font color="Green">Lemma48</font></i></a>, <a class="ref" href="vectsp_4.html#T57">VECTSP_4:57</a></i>;<br/>
<a NAME="E10:62_1_1"/>
<font color="Maroon">u1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">u2</font>
 
<b>by </b><i>, <a class="txt" href="vectsp_5.html#E8:62_1_1"><i><font color="Green">E53</font></i></a>, <a class="ref" href="rlvect_1.html#T21">RLVECT_1:21</a></i>;<br/>
<a NAME="E11:62_1_1"/><b>then </b>
<font color="Maroon">u1</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W1</font> <a href="vectsp_5.html#K2" target="_self">/\</a> <font color="Maroon">W2</font>
 
<b>by </b><i><a class="ref" href="vectsp_5.html#T10" target="_self">Th10</a>, , </i>;<br/>
<a NAME="E12:62_1_1"/><b>then </b>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">v</font> <a href="rlvect_1.html#K4">+</a> <font color="Olive">u</font></span>)</span> where <font color="Olive">u</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font> : <font color="Olive">u</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W1</font> <a href="vectsp_5.html#K2" target="_self">/\</a> <font color="Maroon">W2</font> </span>}</span> 
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E13:62_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">v</font> <a href="vectsp_4.html#K3">+</a> <span class="p1">(<span class="default"><font color="Maroon">W1</font> <a href="vectsp_5.html#K2" target="_self">/\</a> <font color="Maroon">W2</font></span>)</span>
 ;<br/>


</div><b>end;</b></div>

<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E2:62_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">v</font> <a href="vectsp_4.html#K3">+</a> <span class="p1">(<span class="default"><font color="Maroon">W1</font> <a href="vectsp_5.html#K2" target="_self">/\</a> <font color="Maroon">W2</font></span>)</span>
 ;<br/>

<b>then consider </b><font color="Maroon">u</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font><b> such that </b><br/><a NAME="E4:62_1"/><i><font color="Green">E55</font></i>: 
<font color="Maroon">u</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W1</font> <a href="vectsp_5.html#K2" target="_self">/\</a> <font color="Maroon">W2</font>
 <b>and </b><br/><a NAME="E5:62_1"/><i><font color="Green">E56</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">v</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">u</font>
 <b>by </b><i><a class="ref" href="vectsp_4.html#T57">VECTSP_4:57</a></i>;<br/>
<a NAME="E6:62_1"/>
( <font color="Maroon">u</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W1</font> &amp; <font color="Maroon">u</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W2</font> )
 
<b>by </b><i><a class="txt" href="vectsp_5.html#E12"><i><font color="Green">Lemma49</font></i></a>, </i>;<br/>
<a NAME="E7:62_1"/><b>then </b>
( <font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">v</font> <a href="rlvect_1.html#K4">+</a> <font color="Olive">u1</font></span>)</span> where <font color="Olive">u1</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font> : <font color="Olive">u1</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W1</font> </span>}</span>  &amp; <font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">v</font> <a href="rlvect_1.html#K4">+</a> <font color="Olive">u2</font></span>)</span> where <font color="Olive">u2</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font> : <font color="Olive">u2</font> <a href="rlvect_1.html#R1">in</a> <font color="Maroon">W2</font> </span>}</span>  )
 
<b>by </b><i><a class="ref" href="vectsp_5.html#T10" target="_self">Th10</a></i>;<br/>
<a NAME="E8:62_1"/><b>then </b>
( <font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">C1</font> &amp; <font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">C2</font> )
 
<b>by </b><i><a class="ref" href="vectsp_5.html#T7" target="_self">Th7</a>, <a class="txt" href="vectsp_5.html#E11"><i><font color="Green">Lemma48</font></i></a></i>;<br/>
<b>hence </b><a NAME="E9:62_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">C1</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">C2</font>
 <b>by </b><i><a class="ref" href="xboole_0.html#D3">XBOOLE_0:def 3</a></i>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E9:62"/>
<font color="Maroon">C1</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">C2</font> is    <a href="vectsp_4.html#M2">Coset</a> of <font color="Maroon">W1</font> <a href="vectsp_5.html#K2" target="_self">/\</a> <font color="Maroon">W2</font>
 ;<br/>


</div>
