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<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="hidden.html#M1">set</a> ,   <a href="hidden.html#M1">set</a> ] <b>means </b>for <font color="Olive">x</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>1</sub></font>()<br/> for <font color="Olive">y</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>2</sub></font>()<br/> for <font color="Olive">z</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>3</sub></font>()<br/> for <font color="Olive">s</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>4</sub></font>()  st <font color="Maroon">a<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K5">[</a><span class="default"><font color="Olive">x</font>,<font color="Olive">y</font>,<font color="Olive">z</font>,<font color="Olive">s</font></span><a href="domain_1.html#K5">]</a></span> holds <br/><font color="Maroon">P<sub>1</sub></font>[<font color="Olive">x</font>,<font color="Olive">y</font>,<font color="Olive">z</font>,<font color="Olive">s</font>,<font color="Maroon">a<sub>2</sub></font>];<br/>
<a NAME="E1:17_1"/><i><font color="Green">E37</font></i>: 
for <font color="Olive">p</font> being   <a href="subset_1.html#M1">Element</a> of <span class="p1"><a href="zfmisc_1.html#K4">[:</a><span class="default"><font color="Maroon">F<sub>1</sub></font>(),<font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>(),<font color="Maroon">F<sub>4</sub></font>()</span><a href="zfmisc_1.html#K4">:]</a></span>  ex <font color="Olive">t</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>5</sub></font>() st <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">p</font>,<font color="Olive">t</font>]
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="17_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">p</font> be    <a href="subset_1.html#M1">Element</a> of <span class="p1"><a href="zfmisc_1.html#K4">[:</a><span class="default"><font color="Maroon">F<sub>1</sub></font>(),<font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>(),<font color="Maroon">F<sub>4</sub></font>()</span><a href="zfmisc_1.html#K4">:]</a></span>;<br/>

<b>consider </b><font color="Maroon">x1</font> being    <a href="hidden.html#M1">set</a> , <font color="Maroon">y1</font> being    <a href="hidden.html#M1">set</a> , <font color="Maroon">z1</font> being    <a href="hidden.html#M1">set</a> , <font color="Maroon">s1</font> being    <a href="hidden.html#M1">set</a> <b> such that </b><br/><a NAME="E2:17_1_1"/><i><font color="Green">E42</font></i>: 
<font color="Maroon">x1</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F<sub>1</sub></font>()
 <b>and </b><br/><a NAME="E3:17_1_1"/><i><font color="Green">E43</font></i>: 
<font color="Maroon">y1</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F<sub>2</sub></font>()
 <b>and </b><br/><a NAME="E4:17_1_1"/><i><font color="Green">E44</font></i>: 
<font color="Maroon">z1</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F<sub>3</sub></font>()
 <b>and </b><br/><a NAME="E5:17_1_1"/><i><font color="Green">E45</font></i>: 
<font color="Maroon">s1</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F<sub>4</sub></font>()
 <b>and </b><br/><a NAME="E6:17_1_1"/><i><font color="Green">E46</font></i>: 
<font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="mcart_1.html#K4">[</a><span class="default"><font color="Maroon">x1</font>,<font color="Maroon">y1</font>,<font color="Maroon">z1</font>,<font color="Maroon">s1</font></span><a href="mcart_1.html#K4">]</a></span>
 <b>by </b><i><a class="ref" href="mcart_1.html#T83">MCART_1:83</a></i>;<br/>
<b>reconsider </b><font color="Maroon">x1</font> = <font color="Maroon">x1</font> as    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>1</sub></font>() <b>by </b><i/>;<br/>
<b>reconsider </b><font color="Maroon">y1</font> = <font color="Maroon">y1</font> as    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>2</sub></font>() <b>by </b><i/>;<br/>
<b>reconsider </b><font color="Maroon">z1</font> = <font color="Maroon">z1</font> as    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>3</sub></font>() <b>by </b><i/>;<br/>
<b>reconsider </b><font color="Maroon">s1</font> = <font color="Maroon">s1</font> as    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>4</sub></font>() <b>by </b><i/>;<br/>
<b>consider </b><font color="Maroon">t</font> being    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>5</sub></font>()<b> such that </b><br/><a NAME="E12:17_1_1"/><i><font color="Green">E47</font></i>: 
<font color="Maroon">P<sub>1</sub></font>[<font color="Maroon">x1</font>,<font color="Maroon">y1</font>,<font color="Maroon">z1</font>,<font color="Maroon">s1</font>,<font color="Maroon">t</font>]
 <b>by </b><i/>;<br/>
<b>take </b>
<font color="Maroon">t</font>
;<br/>

<b>let </b><font color="Maroon">x</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>1</sub></font>();<br/><b>let </b><font color="Maroon">y</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>2</sub></font>();<br/><b>let </b><font color="Maroon">z</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>3</sub></font>();<br/><b>let </b><font color="Maroon">s</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>4</sub></font>();<br/>







<b>assume </b><a NAME="E13:17_1_1"/>
<font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K5">[</a><span class="default"><font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z</font>,<font color="Maroon">s</font></span><a href="domain_1.html#K5">]</a></span>
 ;<br/>

<a NAME="E14:17_1_1"/><b>then </b>
( <font color="Maroon">x1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x</font> &amp; <font color="Maroon">y1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">y</font> &amp; <font color="Maroon">z1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">z</font> &amp; <font color="Maroon">s1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">s</font> )
 
<b>by </b><i>, <a class="ref" href="mcart_1.html#T33">MCART_1:33</a></i>;<br/>
<b>hence </b><a NAME="E15:17_1_1"/>
<font color="Maroon">P<sub>1</sub></font>[<font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z</font>,<font color="Maroon">s</font>,<font color="Maroon">t</font>]
 <b>by </b><i/>;<br/>


</div><b>end;</b></div>
<b>consider </b><font color="Maroon">f</font> being   <a href="funct_2.html#NM1">Function</a> of <span class="p1"><a href="zfmisc_1.html#K4">[:</a><span class="default"><font color="Maroon">F<sub>1</sub></font>(),<font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>(),<font color="Maroon">F<sub>4</sub></font>()</span><a href="zfmisc_1.html#K4">:]</a></span>,<font color="Maroon">F<sub>5</sub></font>()<b> such that </b><br/><a NAME="E3:17_1"/><i><font color="Green">E59</font></i>: 
for <font color="Olive">p</font> being   <a href="subset_1.html#M1">Element</a> of <span class="p1"><a href="zfmisc_1.html#K4">[:</a><span class="default"><font color="Maroon">F<sub>1</sub></font>(),<font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>(),<font color="Maroon">F<sub>4</sub></font>()</span><a href="zfmisc_1.html#K4">:]</a></span> holds  <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">p</font>,<font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Olive">p</font>]
 <b>from </b><i><a class="ref" href="funct_2.html#S3">FUNCT_2:sch 3</a>();<br/></i>
<b>take </b>
<font color="Maroon">f</font>
;<br/>

<b>let </b><font color="Maroon">x</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>1</sub></font>();<br/><b>let </b><font color="Maroon">y</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>2</sub></font>();<br/><b>let </b><font color="Maroon">z</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>3</sub></font>();<br/><b>let </b><font color="Maroon">s</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>4</sub></font>();<br/>







<b>thus </b><a NAME="E4:17_1"/>
<font color="Maroon">P<sub>1</sub></font>[<font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z</font>,<font color="Maroon">s</font>,<font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <span class="p1"><a href="domain_1.html#K5">[</a><span class="default"><font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z</font>,<font color="Maroon">s</font></span><a href="domain_1.html#K5">]</a></span>]
 <b>by </b><i/>;<br/>


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