<?xml version="1.0"?>
<div class="add">

<b>set </b><font color="Maroon">D</font> = <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font></span>)</span>,<span class="p2">(<span class="default"><a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font></span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span>;<br/>
<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">A</font>, <font color="Olive">B</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font>  st <font color="Maroon">a<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">A</font>,<font color="Olive">B</font></span><a href="domain_1.html#K1">]</a></span> holds <br/><font color="Maroon">a<sub>2</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="pre_topc.html#K4">Cl</a> <span class="p2">(<span class="default"><a href="tops_1.html#K1">Int</a> <span class="p3">(<span class="default"><font color="Olive">A</font> <a href="subset_1.html#K9">/\</a> <font color="Olive">B</font></span>)</span></span>)</span></span>)</span> <a href="subset_1.html#K9">/\</a> <span class="p1">(<span class="default"><font color="Olive">A</font> <a href="subset_1.html#K9">/\</a> <font color="Olive">B</font></span>)</span>;<br/>
<a NAME="E1:32_1_1"/><i><font color="Green">E18</font></i>: 
for <font color="Olive">a</font> being   <a href="subset_1.html#M1">Element</a> of <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font></span>)</span>,<span class="p2">(<span class="default"><a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font></span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span>  ex <font color="Olive">b</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font> st <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">a</font>,<font color="Olive">b</font>]
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="32_1_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">a</font> be    <a href="subset_1.html#M1">Element</a> of <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font></span>)</span>,<span class="p2">(<span class="default"><a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font></span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span>;<br/>

<b>reconsider </b><font color="Maroon">G</font> = <font color="Maroon">a</font> <a href="domain_1.html#K2">`1</a> , <font color="Maroon">F</font> = <font color="Maroon">a</font> <a href="domain_1.html#K3">`2</a>  as    <a href="subset_1.html#M2">Element</a> of  <a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font> ;<br/>
<a NAME="E2:32_1_1_1"/>
( <font color="Maroon">G</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">E</font> where <font color="Olive">E</font> is   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font> : <font color="Olive">E</font> is <a href="tops_1.html#V4">condensed</a> </span>}</span>  &amp; <font color="Maroon">F</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">H</font> where <font color="Olive">H</font> is   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font> : <font color="Olive">H</font> is <a href="tops_1.html#V4">condensed</a> </span>}</span>  )
 
;<br/>
<a NAME="E3:32_1_1_1"/><b>then </b>
(  ex <font color="Olive">E</font> being  <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font> st <br/>( <font color="Olive">E</font> <a href="hidden.html#R1">=</a> <font color="Maroon">G</font> &amp; <font color="Olive">E</font> is <a href="tops_1.html#V4">condensed</a> ) &amp;  ex <font color="Olive">H</font> being  <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font> st <br/>( <font color="Olive">H</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F</font> &amp; <font color="Olive">H</font> is <a href="tops_1.html#V4">condensed</a> ) )
 
;<br/>
<a NAME="E4:32_1_1_1"/><b>then </b>
<span class="p1">(<span class="default"><a href="pre_topc.html#K4">Cl</a> <span class="p2">(<span class="default"><a href="tops_1.html#K1">Int</a> <span class="p3">(<span class="default"><font color="Maroon">G</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">F</font></span>)</span></span>)</span></span>)</span> <a href="subset_1.html#K9">/\</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">F</font></span>)</span> is <a href="tops_1.html#V4">condensed</a>
 
<b>by </b><i><a class="ref" href="tdlat_1.html#T1" target="_self">Th1</a></i>;<br/>
<a NAME="E5:32_1_1_1"/><b>then </b>
<span class="p1">(<span class="default"><a href="pre_topc.html#K4">Cl</a> <span class="p2">(<span class="default"><a href="tops_1.html#K1">Int</a> <span class="p3">(<span class="default"><font color="Maroon">G</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">F</font></span>)</span></span>)</span></span>)</span> <a href="subset_1.html#K9">/\</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">F</font></span>)</span> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">E</font> where <font color="Olive">E</font> is   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font> : <font color="Olive">E</font> is <a href="tops_1.html#V4">condensed</a> </span>}</span> 
 
;<br/>
<b>then reconsider </b><font color="Maroon">b</font> = <span class="p1">(<span class="default"><a href="pre_topc.html#K4">Cl</a> <span class="p2">(<span class="default"><a href="tops_1.html#K1">Int</a> <span class="p3">(<span class="default"><font color="Maroon">G</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">F</font></span>)</span></span>)</span></span>)</span> <a href="subset_1.html#K9">/\</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">F</font></span>)</span> as    <a href="subset_1.html#M2">Element</a> of  <a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font> ;<br/>
<b>take </b>
<font color="Maroon">b</font>
;<br/>

<b>let </b><font color="Maroon">A</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font>, <font color="Maroon">B</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font>;<br/>

<b>assume </b><a NAME="E7:32_1_1_1"/>
<font color="Maroon">a</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">A</font>,<font color="Maroon">B</font></span><a href="domain_1.html#K1">]</a></span>
 ;<br/>

<a NAME="E8:32_1_1_1"/><b>then </b>
<span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">A</font>,<font color="Maroon">B</font></span><a href="domain_1.html#K1">]</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">G</font>,<font color="Maroon">F</font></span><a href="domain_1.html#K1">]</a></span>
 
<b>by </b><i><a class="ref" href="mcart_1.html#T23">MCART_1:23</a></i>;<br/>
<a NAME="E9:32_1_1_1"/><b>then </b>
( <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> <font color="Maroon">G</font> &amp; <font color="Maroon">B</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F</font> )
 
<b>by </b><i><a class="ref" href="zfmisc_1.html#T33">ZFMISC_1:33</a></i>;<br/>
<b>hence </b><a NAME="E10:32_1_1_1"/>
<font color="Maroon">b</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="pre_topc.html#K4">Cl</a> <span class="p2">(<span class="default"><a href="tops_1.html#K1">Int</a> <span class="p3">(<span class="default"><font color="Maroon">A</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">B</font></span>)</span></span>)</span></span>)</span> <a href="subset_1.html#K9">/\</a> <span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">B</font></span>)</span>
 ;<br/>


</div><b>end;</b></div>
<b>consider </b><font color="Maroon">h</font> being   <a href="funct_2.html#NM1">Function</a> of <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font></span>)</span>,<span class="p2">(<span class="default"><a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font></span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span>, <a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font><b> such that </b><br/><a NAME="E3:32_1_1"/><i><font color="Green">E24</font></i>: 
for <font color="Olive">a</font> being   <a href="subset_1.html#M1">Element</a> of <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font></span>)</span>,<span class="p2">(<span class="default"><a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font></span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span> holds  <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">a</font>,<font color="Maroon">h</font> <a href="funct_2.html#K3">.</a> <font color="Olive">a</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">h</font>
;<br/>

<b>let </b><font color="Maroon">A</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font>, <font color="Maroon">B</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="tdlat_1.html#K1" target="_self">Domains_of</a> <font color="Maroon">T</font>;<br/>

<b>thus </b><font color="Maroon">h</font> <a href="binop_1.html#K2">.</a> <font color="Maroon">A</font>,<font color="Maroon">B</font> = 
<font color="Maroon">h</font> <a href="funct_2.html#K3">.</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">A</font>,<font color="Maroon">B</font></span><a href="domain_1.html#K1">]</a></span>

<br/>.= 
<span class="p1">(<span class="default"><a href="pre_topc.html#K4">Cl</a> <span class="p2">(<span class="default"><a href="tops_1.html#K1">Int</a> <span class="p3">(<span class="default"><font color="Maroon">A</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">B</font></span>)</span></span>)</span></span>)</span> <a href="subset_1.html#K9">/\</a> <span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">B</font></span>)</span>
<b>by </b><i/>
;<br/>


</div>
