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<b>let </b><font color="Maroon">H</font> be   <a href="modelc_1.html#NM1">CTL-formula</a>;<br/>

<b>assume </b><a NAME="E1:26"/>
<font color="Maroon">H</font> is <a href="modelc_1.html#V7" target="_self">ExistUntill</a>
 ;<br/>

<b>then consider </b><font color="Maroon">F</font> being   <a href="modelc_1.html#NM1">CTL-formula</a>, <font color="Maroon">G</font> being   <a href="modelc_1.html#NM1">CTL-formula</a><b> such that </b><br/><a NAME="E3:26"/><i><font color="Green">E27</font></i>: 
<font color="Maroon">H</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F</font> <a href="modelc_1.html#K12" target="_self">EU</a> <font color="Maroon">G</font>
 <b>by </b><i/>;<br/>
<a NAME="E4:26"/>
( <font color="Maroon">H</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><span class="p2"><a href="finseq_1.html#K12">&lt;*</a><span class="default">4</span><a href="finseq_1.html#K12">*&gt;</a></span> <a href="finseq_1.html#K8">^</a> <font color="Maroon">F</font></span>)</span> <a href="finseq_1.html#K8">^</a> <font color="Maroon">G</font> &amp; <span class="p1">(<span class="default"><span class="p2"><a href="finseq_1.html#K12">&lt;*</a><span class="default">4</span><a href="finseq_1.html#K12">*&gt;</a></span> <a href="finseq_1.html#K8">^</a> <font color="Maroon">F</font></span>)</span> <a href="finseq_1.html#K8">^</a> <font color="Maroon">G</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="finseq_1.html#K12">&lt;*</a><span class="default">4</span><a href="finseq_1.html#K12">*&gt;</a></span> <a href="finseq_1.html#K8">^</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="finseq_1.html#K8">^</a> <font color="Maroon">G</font></span>)</span> )
 
<b>by </b><i><a class="txt" href="modelc_1.html#E1"><i><font color="Green">Lemma23</font></i></a>, <a class="ref" href="finseq_1.html#T45">FINSEQ_1:45</a></i>;<br/>
<b>hence </b><a NAME="E5:26"/>
<font color="Maroon">H</font> <a href="funct_1.html#K1">.</a> 1 <a href="hidden.html#R1">=</a> 4
 <b>by </b><i><a class="ref" href="finseq_1.html#T58">FINSEQ_1:58</a></i>;<br/>


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