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<b>let </b><font color="Maroon">X</font> be  non <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#NM1">TopSpace</a>;<br/><b>let </b><font color="Maroon">Y</font> be  non <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#NM1">TopSpace</a>;<br/><b>let </b><font color="Maroon">X1</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="pre_topc.html#M1">SubSpace</a> of <font color="Maroon">X</font>, <font color="Maroon">X2</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="pre_topc.html#M1">SubSpace</a> of <font color="Maroon">X</font>;<br/>





<b>assume </b><a NAME="E1:147"/><i><font color="Green">E23</font></i>: 
<font color="Maroon">X</font> <a href="hidden.html#R1">=</a> <font color="Maroon">X1</font> <a href="tsep_1.html#K1">union</a> <font color="Maroon">X2</font>
 ;<br/>

<b>let </b><font color="Maroon">g</font> be   <a href="struct_0.html#NM6">Function</a> of <font color="Maroon">X</font>,<font color="Maroon">Y</font>;<br/>

<b>reconsider </b><font color="Maroon">h</font> = <font color="Maroon">g</font> as   <a href="struct_0.html#NM6">Function</a> of <span class="p1">(<span class="default"><font color="Maroon">X1</font> <a href="tsep_1.html#K1">union</a> <font color="Maroon">X2</font></span>)</span>,<font color="Maroon">Y</font> <b>by </b><i><a class="ref" href="tmap_1.html#T31" target="_self">Th31</a></i>;<br/>
<a NAME="E3:147"/><i><font color="Green">E29</font></i>: 
<font color="Maroon">X1</font> is    <a href="pre_topc.html#M1">SubSpace</a> of <font color="Maroon">X1</font> <a href="tsep_1.html#K1">union</a> <font color="Maroon">X2</font>
 
<b>by </b><i><a class="ref" href="tsep_1.html#T22">TSEP_1:22</a></i>;<br/>
<a NAME="E4:147"/><i><font color="Green">E35</font></i>: 
<font color="Maroon">X2</font> is    <a href="pre_topc.html#M1">SubSpace</a> of <font color="Maroon">X1</font> <a href="tsep_1.html#K1">union</a> <font color="Maroon">X2</font>
 
<b>by </b><i><a class="ref" href="tsep_1.html#T22">TSEP_1:22</a></i>;<br/>
<a NAME="E5:147"/><i><font color="Green">E36</font></i>: 
<font color="Maroon">h</font> <a href="tmap_1.html#K3" target="_self">|</a> <font color="Maroon">X1</font> <a href="funct_2.html#R2">=</a> <font color="Maroon">g</font> <a href="tmap_1.html#K2" target="_self">|</a> <font color="Maroon">X1</font>
 
<b>by </b><i><a class="ref" href="tmap_1.html#T32" target="_self">Th32</a>, </i>;<br/>
<a NAME="E6:147"/>
<font color="Maroon">h</font> <a href="tmap_1.html#K3" target="_self">|</a> <font color="Maroon">X2</font> <a href="funct_2.html#R2">=</a> <font color="Maroon">g</font> <a href="tmap_1.html#K2" target="_self">|</a> <font color="Maroon">X2</font>
 
<b>by </b><i><a class="ref" href="tmap_1.html#T33" target="_self">Th33</a>, </i>;<br/>
<b>hence </b><a NAME="E7:147"/>
<font color="Maroon">g</font> <a href="funct_2.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">g</font> <a href="tmap_1.html#K2" target="_self">|</a> <font color="Maroon">X1</font></span>)</span> <a href="tmap_1.html#K10" target="_self">union</a> <span class="p1">(<span class="default"><font color="Maroon">g</font> <a href="tmap_1.html#K2" target="_self">|</a> <font color="Maroon">X2</font></span>)</span>
 <b>by </b><i><a class="ref" href="tmap_1.html#T34" target="_self">Th34</a>, <a class="ref" href="tmap_1.html#T29" target="_self">Th29</a></i>;<br/>


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