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<b>let </b><font color="Maroon">Y0</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="tsp_1.html#M2">SubSpace</a> of <font color="Maroon">Y</font>;<br/>

<b>assume </b><a NAME="E1:18_2_1"/><i><font color="Green">E18</font></i>: 
not <font color="Maroon">Y0</font> is <a href="t_0topsp.html#V2">T_0</a>
 ;<br/>

<b>assume </b><a NAME="E2:18_2_1"/><i><font color="Green">E19</font></i>: 
<font color="Maroon">Y0</font> is <a href="tsp_2.html#V2" target="_self">maximal_T_0</a>
 ;<br/>

<b>reconsider </b><font color="Maroon">A</font> = the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">Y0</font> as   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">Y</font> <b>by </b><i/>;<br/>
<a NAME="E4:18_2_1"/>
<font color="Maroon">A</font> is <a href="tsp_2.html#V1" target="_self">maximal_T_0</a>
 
<b>by </b><i>, <a class="ref" href="tsp_2.html#D1" target="_self">Def1</a></i>;<br/>
<a NAME="E5:18_2_1"/><b>then </b>
<font color="Maroon">A</font> is <a href="tsp_1.html#V1">T_0</a>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E6:18_2_1"/>
contradiction
 <b>by </b><i>, <a class="ref" href="tsp_1.html#T15">TSP_1:15</a></i>;<br/>


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