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<b>let </b><font color="Maroon">X</font> be  non <a href="struct_0.html#V3">empty</a> non <a href="realset2.html#V3">trivial</a> <a href="pre_topc.html#NM1">TopSpace</a>;<br/><b>let </b><font color="Maroon">Y1</font> be  non <a href="struct_0.html#V3">empty</a> <a href="tex_2.html#V2">proper</a>  <a href="pre_topc.html#M1">SubSpace</a> of <font color="Maroon">X</font>;<br/>



<b>reconsider </b><font color="Maroon">A1</font> = the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">Y1</font> as   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">X</font> <b>by </b><i><a class="ref" href="tsep_1.html#T1">TSEP_1:1</a></i>;<br/>
<a NAME="E2:8"/>
<font color="Maroon">A1</font> is <a href="tex_2.html#V1">proper</a>
 
<b>by </b><i><a class="ref" href="tex_2.html#T13">TEX_2:13</a></i>;<br/>
<a NAME="E3:8"/><b>then </b>
<font color="Maroon">A1</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">X</font>
 
<b>by </b><i><a class="ref" href="tex_2.html#T5">TEX_2:5</a></i>;<br/>
<a NAME="E4:8"/><b>then </b>
<font color="Maroon">A1</font> <a href="subset_1.html#K3">`</a>  <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a> 
 
<b>by </b><i><a class="ref" href="tops_3.html#T2">TOPS_3:2</a></i>;<br/>
<b>then consider </b><font color="Maroon">Y2</font> being  non <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#V1">strict</a>  <a href="pre_topc.html#M1">SubSpace</a> of <font color="Maroon">X</font><b> such that </b><br/><a NAME="E6:8"/><i><font color="Green">E16</font></i>: 
<font color="Maroon">A1</font> <a href="subset_1.html#K3">`</a>  <a href="hidden.html#R1">=</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">Y2</font>
 <b>by </b><i><a class="ref" href="tsep_1.html#T10">TSEP_1:10</a></i>;<br/>
<a NAME="E7:8"/><i><font color="Green">E24</font></i>: 
for <font color="Olive">P</font>, <font color="Olive">Q</font> being  <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">X</font>  st <font color="Olive">P</font> <a href="hidden.html#R1">=</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">Y1</font> &amp; <font color="Olive">Q</font> <a href="hidden.html#R1">=</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">Y2</font> holds <br/><font color="Olive">P</font>,<font color="Olive">Q</font> <a href="tsep_2.html#R2">constitute_a_decomposition</a> 
 
<b>by </b><i>, <a class="ref" href="tsep_2.html#T6">TSEP_2:6</a></i>;<br/>
<a NAME="E8:8"/><b>then </b>
<font color="Maroon">Y1</font>,<font color="Maroon">Y2</font> <a href="tsep_2.html#R4">constitute_a_decomposition</a> 
 
<b>by </b><i><a class="ref" href="tsep_2.html#D2">TSEP_2:def 2</a></i>;<br/>
<b>then reconsider </b><font color="Maroon">Y2</font> = <font color="Maroon">Y2</font> as  non <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#V1">strict</a> <a href="tex_2.html#V2">proper</a>  <a href="pre_topc.html#M1">SubSpace</a> of <font color="Maroon">X</font> <b>by </b><i/>;<br/>
<b>take </b>
<font color="Maroon">Y2</font>
;<br/>

<b>thus </b><a NAME="E10:8"/>
<font color="Maroon">Y1</font>,<font color="Maroon">Y2</font> <a href="tsep_2.html#R4">constitute_a_decomposition</a> 
 <b>by </b><i>, <a class="ref" href="tsep_2.html#D2">TSEP_2:def 2</a></i>;<br/>


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