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<b>let </b><font color="Maroon">X</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">Y</font> be   <a href="clvect_1.html#NM2">ComplexLinearSpace</a>;<br/><b>let </b><font color="Maroon">f</font> be   <a href="clvect_1.html#NM1">VECTOR</a> of <span class="p1">(<span class="default"><a href="clopban1.html#K3" target="_self">ComplexVectSpace</a> <font color="Maroon">X</font>,<font color="Maroon">Y</font></span>)</span>, <font color="Maroon">g</font> be   <a href="clvect_1.html#NM1">VECTOR</a> of <span class="p1">(<span class="default"><a href="clopban1.html#K3" target="_self">ComplexVectSpace</a> <font color="Maroon">X</font>,<font color="Maroon">Y</font></span>)</span>, <font color="Maroon">h</font> be   <a href="clvect_1.html#NM1">VECTOR</a> of <span class="p1">(<span class="default"><a href="clopban1.html#K3" target="_self">ComplexVectSpace</a> <font color="Maroon">X</font>,<font color="Maroon">Y</font></span>)</span>;<br/>





<b>reconsider </b><font color="Maroon">f'</font> = <font color="Maroon">f</font>, <font color="Maroon">g'</font> = <font color="Maroon">g</font>, <font color="Maroon">h'</font> = <font color="Maroon">h</font> as    <a href="fraenkel.html#M2">Element</a> of  <a href="fraenkel.html#K1">Funcs</a> <font color="Maroon">X</font>,the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">Y</font> ;<br/>
<div><b>hereby </b>
<div class="add"><b>assume </b><a NAME="E1:19_1"/><i><font color="Green">E38</font></i>: 
<font color="Maroon">h</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">g</font>
 ;<br/><b>let </b><font color="Maroon">x</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">X</font>;<br/><a NAME="E2:19_1"/>
<font color="Maroon">h</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="lopban_1.html#K2">FuncAdd</a> <font color="Maroon">X</font>,<font color="Maroon">Y</font></span>)</span> <a href="funcsdom.html#K1">.</a> <font color="Maroon">f'</font>,<font color="Maroon">g'</font>
 <b>by </b><i/>;<br/><b>hence </b><a NAME="E3:19_1"/>
<font color="Maroon">h</font> <a href="clopban1.html#K4" target="_self">.</a> <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="clopban1.html#K4" target="_self">.</a> <font color="Maroon">x</font></span>)</span> <a href="rlvect_1.html#K4">+</a> <span class="p1">(<span class="default"><font color="Maroon">g</font> <a href="clopban1.html#K4" target="_self">.</a> <font color="Maroon">x</font></span>)</span>
 <b>by </b><i><a class="ref" href="lopban_1.html#T3">LOPBAN_1:3</a></i>;<br/></div>
<b>end;</b></div>

<b>assume </b><a NAME="E3:19"/>
for <font color="Olive">x</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">X</font> holds  <font color="Maroon">h</font> <a href="clopban1.html#K4" target="_self">.</a> <font color="Olive">x</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="clopban1.html#K4" target="_self">.</a> <font color="Olive">x</font></span>)</span> <a href="rlvect_1.html#K4">+</a> <span class="p1">(<span class="default"><font color="Maroon">g</font> <a href="clopban1.html#K4" target="_self">.</a> <font color="Olive">x</font></span>)</span>
 ;<br/>

<a NAME="E4:19"/><b>then </b><i><font color="Green">E44</font></i>: 
for <font color="Olive">x</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">X</font> holds  <font color="Maroon">h'</font> <a href="funct_2.html#K3">.</a> <font color="Olive">x</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">f'</font> <a href="funct_2.html#K3">.</a> <font color="Olive">x</font></span>)</span> <a href="rlvect_1.html#K4">+</a> <span class="p1">(<span class="default"><font color="Maroon">g'</font> <a href="funct_2.html#K3">.</a> <font color="Olive">x</font></span>)</span>
 
;<br/>
<a NAME="E5:19"/>
<font color="Maroon">f</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">g</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="lopban_1.html#K2">FuncAdd</a> <font color="Maroon">X</font>,<font color="Maroon">Y</font></span>)</span> <a href="funcsdom.html#K1">.</a> <font color="Maroon">f'</font>,<font color="Maroon">g'</font>
 
;<br/>
<b>hence </b><a NAME="E6:19"/>
<font color="Maroon">h</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f</font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">g</font>
 <b>by </b><i>, <a class="ref" href="lopban_1.html#T3">LOPBAN_1:3</a></i>;<br/>


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