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<b>let </b><font color="Maroon">c<sub>4</sub></font>, <font color="Maroon">c<sub>5</sub></font> be   <a href="struct_0.html#NM7">Function</a> of <span class="p1">(<span class="default"><a href="waybel26.html#K1">oContMaps</a> <font color="Maroon">c<sub>2</sub></font>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="waybel26.html#NK2" target="_self">-TOP_prod</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="waybel_5.html#K7">=&gt;</a> <font color="Maroon">c<sub>3</sub></font></span>)</span></span>)</span></span>)</span>,<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="waybel26.html#K1">oContMaps</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="yellow_1.html#K6">|^</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:41_1_1"/><i><font color="Green">E20</font></i>: 
for <font color="Olive">b<sub>1</sub></font> being <a href="pre_topc.html#V5">continuous</a> <a href="struct_0.html#NM7">Function</a> of <font color="Maroon">c<sub>2</sub></font>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="waybel26.html#NK2" target="_self">-TOP_prod</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="waybel_5.html#K7">=&gt;</a> <font color="Maroon">c<sub>3</sub></font></span>)</span></span>)</span> holds <font color="Maroon">c<sub>4</sub></font> <a href="funct_1.html#K1">.</a> <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="funct_6.html#K10">commute</a> <font color="Olive">b<sub>1</sub></font>
 <b>and </b><br/><a NAME="E2:41_1_1"/><i><font color="Green">E21</font></i>: 
for <font color="Olive">b<sub>1</sub></font> being <a href="pre_topc.html#V5">continuous</a> <a href="struct_0.html#NM7">Function</a> of <font color="Maroon">c<sub>2</sub></font>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="waybel26.html#NK2" target="_self">-TOP_prod</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="waybel_5.html#K7">=&gt;</a> <font color="Maroon">c<sub>3</sub></font></span>)</span></span>)</span> holds <font color="Maroon">c<sub>5</sub></font> <a href="funct_1.html#K1">.</a> <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="funct_6.html#K10">commute</a> <font color="Olive">b<sub>1</sub></font>
 ;<br/>

<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="41_1_1_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">c<sub>6</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="waybel26.html#K1">oContMaps</a> <font color="Maroon">c<sub>2</sub></font>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="waybel26.html#NK2" target="_self">-TOP_prod</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="waybel_5.html#K7">=&gt;</a> <font color="Maroon">c<sub>3</sub></font></span>)</span></span>)</span></span>)</span>;<br/><b>reconsider </b><font color="Maroon">c<sub>7</sub></font> = <font color="Maroon">c<sub>6</sub></font> as  <a href="pre_topc.html#V5">continuous</a> <a href="struct_0.html#NM7">Function</a> of <font color="Maroon">c<sub>2</sub></font>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="waybel26.html#NK2" target="_self">-TOP_prod</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="waybel_5.html#K7">=&gt;</a> <font color="Maroon">c<sub>3</sub></font></span>)</span></span>)</span> <b>by </b><i><a class="ref" href="waybel26.html#T2">WAYBEL26:2</a></i>;<br/><b>thus </b><font color="Maroon">c<sub>4</sub></font> <a href="yellow_6.html#K3">.</a> <font color="Maroon">c<sub>6</sub></font> = 
 <a href="funct_6.html#K10">commute</a> <font color="Maroon">c<sub>7</sub></font>
<b>by </b><i><a class="txt" href="waybel29.html#E1:41_1_1"><i><font color="Green">E20</font></i></a></i>
<br/>.= 
<font color="Maroon">c<sub>5</sub></font> <a href="yellow_6.html#K3">.</a> <font color="Maroon">c<sub>6</sub></font>
<b>by </b><i><a class="txt" href="waybel29.html#E2:41_1_1"><i><font color="Green">E21</font></i></a></i>
;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E4:41_1_1"/>
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>5</sub></font>
 <b>by </b><i><a class="ref" href="funct_2.html#T113">FUNCT_2:113</a></i>;<br/>


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