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<b>reconsider </b><font color="Maroon">FAB</font> =  <a href="funct_2.html#K1">Funcs</a> <font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>() as  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a>  <b>by </b><i><a class="ref" href="funct_2.html#T11">FUNCT_2:11</a></i>;<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">tv</font> being  <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>()  st <font color="Olive">tv</font> <a href="hidden.html#R1">=</a> <font color="Maroon">a<sub>2</sub></font> holds <br/>for <font color="Olive">a</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>2</sub></font>() holds  <font color="Olive">tv</font> <a href="funct_2.html#K3">.</a> <font color="Olive">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>4</sub></font>(<font color="Maroon">a<sub>1</sub></font>,<font color="Olive">a</font>);<br/>
<div><i><font color="Green">E29</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="24_1_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">x</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="dtconstr.html#K6">Terminals</a> <font color="Maroon">F<sub>1</sub></font>();<br/><b>deffunc </b><font color="Maroon">H<sub>1</sub></font>(   <a href="hidden.html#M1">set</a> ) <b>-&gt; </b>   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>3</sub></font>() = <font color="Maroon">F<sub>4</sub></font>(<font color="Maroon">x</font>,<font color="Maroon">a<sub>1</sub></font>);<br/><b>consider </b><font color="Maroon">y</font> being   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>()<b> such that </b><br/><a NAME="E2:24_1_1"/><i><font color="Green">E30</font></i>: 
for <font color="Olive">a</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>2</sub></font>() holds  <font color="Maroon">y</font> <a href="funct_2.html#K3">.</a> <font color="Olive">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">H<sub>1</sub></font>(<font color="Olive">a</font>)
 <b>from </b><i><a class="ref" href="funct_2.html#S4">FUNCT_2:sch 4</a>();<br/></i><a NAME="E3:24_1_1"/>
( <font color="Maroon">F<sub>2</sub></font>() <a href="hidden.html#R1">=</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">y</font> &amp;  <a href="relset_1.html#K5">rng</a> <font color="Maroon">y</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">F<sub>3</sub></font>() )
 <b>by </b><i><a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>;<br/><b>then reconsider </b><font color="Maroon">y</font> = <font color="Maroon">y</font> as    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">FAB</font> <b>by </b><i><a class="ref" href="funct_2.html#D2">FUNCT_2:def 2</a></i>;<br/><b>take </b><font color="Maroon">y</font> = <font color="Maroon">y</font>;<br/><b>thus </b><a NAME="E5:24_1_1"/>
<font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">x</font>,<font color="Maroon">y</font>]
 <b>by </b><i/>;<br/></div><b>end;</b></div>
<b>consider </b><font color="Maroon">TV</font> being   <a href="funct_2.html#NM1">Function</a> of  <a href="dtconstr.html#K6">Terminals</a> <font color="Maroon">F<sub>1</sub></font>(),<font color="Maroon">FAB</font><b> such that </b><br/><a NAME="E4:24_1"/><i><font color="Green">E32</font></i>: 
for <font color="Olive">e</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="dtconstr.html#K6">Terminals</a> <font color="Maroon">F<sub>1</sub></font>() holds  <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">e</font>,<font color="Maroon">TV</font> <a href="funct_2.html#K3">.</a> <font color="Olive">e</font>]
 <b>from </b><i><a class="ref" href="funct_2.html#S3">FUNCT_2:sch 3</a>();<br/></i>
<b>defpred </b><font color="Maroon">S<sub>2</sub></font>[   <a href="hidden.html#M1">set</a> ,   <a href="hidden.html#M1">set</a> ,   <a href="hidden.html#M1">set</a> ,   <a href="hidden.html#M1">set</a> ] <b>means </b>for <font color="Olive">a</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>2</sub></font>()<br/> for <font color="Olive">ntv</font> being  <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>()  st <font color="Olive">ntv</font> <a href="hidden.html#R1">=</a> <font color="Maroon">a<sub>4</sub></font> holds <br/><font color="Olive">ntv</font> <a href="funct_2.html#K3">.</a> <font color="Olive">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>5</sub></font>(<font color="Maroon">a<sub>1</sub></font>,<font color="Maroon">a<sub>2</sub></font>,<font color="Maroon">a<sub>3</sub></font>,<font color="Olive">a</font>);<br/>
<div><i><font color="Green">E35</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="24_1_2"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">x</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="dtconstr.html#K7">NonTerminals</a> <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">FAB</font>, <font color="Maroon">z</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">FAB</font>;<br/><b>deffunc </b><font color="Maroon">H<sub>1</sub></font>(   <a href="hidden.html#M1">set</a> ) <b>-&gt; </b>   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>3</sub></font>() = <font color="Maroon">F<sub>5</sub></font>(<font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z</font>,<font color="Maroon">a<sub>1</sub></font>);<br/><b>consider </b><font color="Maroon">fab</font> being   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>()<b> such that </b><br/><a NAME="E2:24_1_2"/><i><font color="Green">E36</font></i>: 
for <font color="Olive">a</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>2</sub></font>() holds  <font color="Maroon">fab</font> <a href="funct_2.html#K3">.</a> <font color="Olive">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">H<sub>1</sub></font>(<font color="Olive">a</font>)
 <b>from </b><i><a class="ref" href="funct_2.html#S4">FUNCT_2:sch 4</a>();<br/></i><a NAME="E3:24_1_2"/>
( <font color="Maroon">F<sub>2</sub></font>() <a href="hidden.html#R1">=</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">fab</font> &amp;  <a href="relset_1.html#K5">rng</a> <font color="Maroon">fab</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">F<sub>3</sub></font>() )
 <b>by </b><i><a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>;<br/><b>then reconsider </b><font color="Maroon">fab</font> = <font color="Maroon">fab</font> as    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">FAB</font> <b>by </b><i><a class="ref" href="funct_2.html#D2">FUNCT_2:def 2</a></i>;<br/><b>take </b><font color="Maroon">fab</font> = <font color="Maroon">fab</font>;<br/><b>thus </b><a NAME="E5:24_1_2"/>
<font color="Maroon">S<sub>2</sub></font>[<font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z</font>,<font color="Maroon">fab</font>]
 <b>by </b><i/>;<br/></div><b>end;</b></div>
<b>consider </b><font color="Maroon">NTV</font> being   <a href="funct_2.html#NM1">Function</a> of <span class="p1"><a href="zfmisc_1.html#K3">[:</a><span class="default"><span class="p2">(<span class="default"><a href="dtconstr.html#K7">NonTerminals</a> <font color="Maroon">F<sub>1</sub></font>()</span>)</span>,<font color="Maroon">FAB</font>,<font color="Maroon">FAB</font></span><a href="zfmisc_1.html#K3">:]</a></span>,<font color="Maroon">FAB</font><b> such that </b><br/><a NAME="E7:24_1"/><i><font color="Green">E38</font></i>: 
for <font color="Olive">x</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="dtconstr.html#K7">NonTerminals</a> <font color="Maroon">F<sub>1</sub></font>()<br/> for <font color="Olive">y</font>, <font color="Olive">z</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">FAB</font> holds  <font color="Maroon">S<sub>2</sub></font>[<font color="Olive">x</font>,<font color="Olive">y</font>,<font color="Olive">z</font>,<font color="Maroon">NTV</font> <a href="funct_2.html#K3">.</a> <span class="p1"><a href="bintree1.html#K3" target="_self">[</a><span class="default"><font color="Olive">x</font>,<font color="Olive">y</font>,<font color="Olive">z</font></span><a href="bintree1.html#K3" target="_self">]</a></span>]
 <b>from </b><i><a class="ref" href="multop_1.html#S1">MULTOP_1:sch 1</a>();<br/></i>
<b>deffunc </b><font color="Maroon">H<sub>1</sub></font>(  <a href="dtconstr.html#NM2">Terminal</a> of <font color="Maroon">F<sub>1</sub></font>()) <b>-&gt; </b>   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">FAB</font> = <font color="Maroon">TV</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">a<sub>1</sub></font>;<br/>
<b>deffunc </b><font color="Maroon">H<sub>2</sub></font>(   <a href="subset_1.html#M2">Element</a> of  <a href="dtconstr.html#K7">NonTerminals</a> <font color="Maroon">F<sub>1</sub></font>(),   <a href="hidden.html#M1">set</a> ,   <a href="hidden.html#M1">set</a> ,   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">FAB</font>,   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">FAB</font>) <b>-&gt; </b>   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">FAB</font> = <font color="Maroon">NTV</font> <a href="funct_2.html#K3">.</a> <span class="p1"><a href="bintree1.html#K3" target="_self">[</a><span class="default"><font color="Maroon">a<sub>1</sub></font>,<font color="Maroon">a<sub>4</sub></font>,<font color="Maroon">a<sub>5</sub></font></span><a href="bintree1.html#K3" target="_self">]</a></span>;<br/>
<b>consider </b><font color="Maroon">f</font> being   <a href="funct_2.html#NM1">Function</a> of  <a href="dtconstr.html#K4">TS</a> <font color="Maroon">F<sub>1</sub></font>(),<font color="Maroon">FAB</font><b> such that </b><br/><a NAME="E9:24_1"/><i><font color="Green">E39</font></i>: 
( ( for <font color="Olive">t</font> being  <a href="dtconstr.html#NM2">Terminal</a> of <font color="Maroon">F<sub>1</sub></font>() holds  <font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><a href="dtconstr.html#K8">root-tree</a> <font color="Olive">t</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">H<sub>1</sub></font>(<font color="Olive">t</font>) ) &amp; ( for <font color="Olive">nt</font> being  <a href="dtconstr.html#NM3">NonTerminal</a> of <font color="Maroon">F<sub>1</sub></font>()<br/> for <font color="Olive">tl</font>, <font color="Olive">tr</font> being   <a href="dtconstr.html#M1">Element</a> of  <a href="dtconstr.html#K4">TS</a> <font color="Maroon">F<sub>1</sub></font>()<br/> for <font color="Olive">rtl</font>, <font color="Olive">rtr</font> being  <a href="lang1.html#NM1">Symbol</a> of <font color="Maroon">F<sub>1</sub></font>()  st <font color="Olive">rtl</font> <a href="hidden.html#R1">=</a>  <a href="bintree1.html#K1" target="_self">root-label</a> <font color="Olive">tl</font> &amp; <font color="Olive">rtr</font> <a href="hidden.html#R1">=</a>  <a href="bintree1.html#K1" target="_self">root-label</a> <font color="Olive">tr</font> &amp; <font color="Olive">nt</font> <a href="lang1.html#R1">==&gt;</a> <span class="p1"><a href="lang1.html#K4">&lt;*</a><span class="default"><font color="Olive">rtl</font>,<font color="Olive">rtr</font></span><a href="lang1.html#K4">*&gt;</a></span> holds <br/>for <font color="Olive">xl</font>, <font color="Olive">xr</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">FAB</font>  st <font color="Olive">xl</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Olive">tl</font> &amp; <font color="Olive">xr</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Olive">tr</font> holds <br/><font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> <span class="p1">(<span class="default"><font color="Olive">nt</font> <a href="trees_4.html#K10">-tree</a> <font color="Olive">tl</font>,<font color="Olive">tr</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">H<sub>2</sub></font>(<font color="Olive">nt</font>,<font color="Olive">rtl</font>,<font color="Olive">rtr</font>,<font color="Olive">xl</font>,<font color="Olive">xr</font>) ) )
 <b>from </b><i><a class="ref" href="bintree1.html#S3" target="_self">BINTREE1:sch 3</a>();<br/></i>
<b>reconsider </b><font color="Maroon">f'</font> = <font color="Maroon">f</font> as   <a href="funct_2.html#NM1">Function</a> of  <a href="dtconstr.html#K4">TS</a> <font color="Maroon">F<sub>1</sub></font>(), <a href="funct_2.html#K1">Funcs</a> <font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>() ;<br/>
<b>take </b>
<font color="Maroon">f'</font>
;<br/>

<div><b>hereby </b>
<div class="add"><b>let </b><font color="Maroon">t</font> be   <a href="dtconstr.html#NM2">Terminal</a> of <font color="Maroon">F<sub>1</sub></font>();<br/><b>consider </b><font color="Maroon">TVt</font> being   <a href="funct_1.html#NM1">Function</a><b> such that </b><br/><a NAME="E2:24_1_3"/><i><font color="Green">E40</font></i>: 
( <font color="Maroon">TV</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">t</font> <a href="hidden.html#R1">=</a> <font color="Maroon">TVt</font> &amp;  <a href="relat_1.html#K1">dom</a> <font color="Maroon">TVt</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>2</sub></font>() &amp;  <a href="relat_1.html#K2">rng</a> <font color="Maroon">TVt</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">F<sub>3</sub></font>() )
 <b>by </b><i><a class="ref" href="funct_2.html#D2">FUNCT_2:def 2</a></i>;<br/><b>reconsider </b><font color="Maroon">TVt</font> = <font color="Maroon">TVt</font> as   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>() <b>by </b><i>, <a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a>, <a class="ref" href="relset_1.html#T11">RELSET_1:11</a></i>;<br/><b>take </b><font color="Maroon">TVt</font> = <font color="Maroon">TVt</font>;<br/><b>thus </b><a NAME="E4:24_1_3"/>
<font color="Maroon">TVt</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f'</font> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><a href="dtconstr.html#K8">root-tree</a> <font color="Maroon">t</font></span>)</span>
 <b>by </b><i>, </i>;<br/><b>let </b><font color="Maroon">a</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>2</sub></font>();<br/><b>thus </b><a NAME="E5:24_1_3"/>
<font color="Maroon">TVt</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>4</sub></font>(<font color="Maroon">t</font>,<font color="Maroon">a</font>)
 <b>by </b><i>, </i>;<br/></div>
<b>end;</b></div>

<b>let </b><font color="Maroon">nt</font> be   <a href="dtconstr.html#NM3">NonTerminal</a> of <font color="Maroon">F<sub>1</sub></font>();<br/><b>let </b><font color="Maroon">t1</font> be    <a href="dtconstr.html#M1">Element</a> of  <a href="dtconstr.html#K4">TS</a> <font color="Maroon">F<sub>1</sub></font>(), <font color="Maroon">t2</font> be    <a href="dtconstr.html#M1">Element</a> of  <a href="dtconstr.html#K4">TS</a> <font color="Maroon">F<sub>1</sub></font>();<br/><b>let </b><font color="Maroon">rtl</font> be   <a href="lang1.html#NM1">Symbol</a> of <font color="Maroon">F<sub>1</sub></font>(), <font color="Maroon">rtr</font> be   <a href="lang1.html#NM1">Symbol</a> of <font color="Maroon">F<sub>1</sub></font>();<br/>





<b>assume </b><a NAME="E12:24_1"/><i><font color="Green">E41</font></i>: 
( <font color="Maroon">rtl</font> <a href="hidden.html#R1">=</a>  <a href="bintree1.html#K1" target="_self">root-label</a> <font color="Maroon">t1</font> &amp; <font color="Maroon">rtr</font> <a href="hidden.html#R1">=</a>  <a href="bintree1.html#K1" target="_self">root-label</a> <font color="Maroon">t2</font> &amp; <font color="Maroon">nt</font> <a href="lang1.html#R1">==&gt;</a> <span class="p1"><a href="lang1.html#K4">&lt;*</a><span class="default"><font color="Maroon">rtl</font>,<font color="Maroon">rtr</font></span><a href="lang1.html#K4">*&gt;</a></span> )
 ;<br/>

<b>consider </b><font color="Maroon">f1</font> being   <a href="funct_1.html#NM1">Function</a><b> such that </b><br/><a NAME="E14:24_1"/><i><font color="Green">E42</font></i>: 
( <font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">t1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f1</font> &amp;  <a href="relat_1.html#K1">dom</a> <font color="Maroon">f1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>2</sub></font>() &amp;  <a href="relat_1.html#K2">rng</a> <font color="Maroon">f1</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">F<sub>3</sub></font>() )
 <b>by </b><i><a class="ref" href="funct_2.html#D2">FUNCT_2:def 2</a></i>;<br/>
<b>reconsider </b><font color="Maroon">f1</font> = <font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">t1</font> as   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>() <b>by </b><i>, <a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a>, <a class="ref" href="relset_1.html#T11">RELSET_1:11</a></i>;<br/>
<b>consider </b><font color="Maroon">f2</font> being   <a href="funct_1.html#NM1">Function</a><b> such that </b><br/><a NAME="E17:24_1"/><i><font color="Green">E43</font></i>: 
( <font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">t2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f2</font> &amp;  <a href="relat_1.html#K1">dom</a> <font color="Maroon">f2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>2</sub></font>() &amp;  <a href="relat_1.html#K2">rng</a> <font color="Maroon">f2</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">F<sub>3</sub></font>() )
 <b>by </b><i><a class="ref" href="funct_2.html#D2">FUNCT_2:def 2</a></i>;<br/>
<b>reconsider </b><font color="Maroon">f2</font> = <font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">t2</font> as   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>() <b>by </b><i>, <a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a>, <a class="ref" href="relset_1.html#T11">RELSET_1:11</a></i>;<br/>
<a NAME="E19:24_1"/>
<font color="Maroon">NTV</font> <a href="funct_2.html#K3">.</a> <span class="p1"><a href="bintree1.html#K3" target="_self">[</a><span class="default"><font color="Maroon">nt</font>,<span class="p2">(<span class="default"><font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">t1</font></span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">t2</font></span>)</span></span><a href="bintree1.html#K3" target="_self">]</a></span> <a href="hidden.html#R2">in</a> <font color="Maroon">FAB</font>
 
;<br/>
<b>then consider </b><font color="Maroon">ntvval</font> being   <a href="funct_1.html#NM1">Function</a><b> such that </b><br/><a NAME="E21:24_1"/><i><font color="Green">E55</font></i>: 
( <font color="Maroon">ntvval</font> <a href="hidden.html#R1">=</a> <font color="Maroon">NTV</font> <a href="funct_1.html#K1">.</a> <span class="p1"><a href="bintree1.html#K3" target="_self">[</a><span class="default"><font color="Maroon">nt</font>,<font color="Maroon">f1</font>,<font color="Maroon">f2</font></span><a href="bintree1.html#K3" target="_self">]</a></span> &amp;  <a href="relat_1.html#K1">dom</a> <font color="Maroon">ntvval</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>2</sub></font>() &amp;  <a href="relat_1.html#K2">rng</a> <font color="Maroon">ntvval</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">F<sub>3</sub></font>() )
 <b>by </b><i><a class="ref" href="funct_2.html#D2">FUNCT_2:def 2</a></i>;<br/>
<b>reconsider </b><font color="Maroon">ntvval</font> = <font color="Maroon">ntvval</font> as   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon">F<sub>3</sub></font>() <b>by </b><i>, <a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a>, <a class="ref" href="relset_1.html#T11">RELSET_1:11</a></i>;<br/>
<b>take </b>
<font color="Maroon">ntvval</font>
;<br/>

<b>take </b>
<font color="Maroon">f1</font>
;<br/>

<b>take </b>
<font color="Maroon">f2</font>
;<br/>

<b>thus </b><a NAME="E23:24_1"/>
( <font color="Maroon">ntvval</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f'</font> <a href="funct_1.html#K1">.</a> <span class="p1">(<span class="default"><font color="Maroon">nt</font> <a href="trees_4.html#K10">-tree</a> <font color="Maroon">t1</font>,<font color="Maroon">t2</font></span>)</span> &amp; <font color="Maroon">f1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f'</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">t1</font> &amp; <font color="Maroon">f2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f'</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">t2</font> )
 <b>by </b><i>, , </i>;<br/>

<b>thus </b><a NAME="E24:24_1"/>
for <font color="Olive">a</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>2</sub></font>() holds  <font color="Maroon">ntvval</font> <a href="funct_2.html#K3">.</a> <font color="Olive">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>5</sub></font>(<font color="Maroon">nt</font>,<font color="Maroon">f1</font>,<font color="Maroon">f2</font>,<font color="Olive">a</font>)
 <b>by </b><i>, </i>;<br/>


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