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<b>let </b><font color="Maroon">p</font> be   <a href="zf_lang.html#NM2">ZF-formula</a>;<br/><b>let </b><font color="Maroon">q</font> be   <a href="zf_lang.html#NM2">ZF-formula</a>;<br/><b>let </b><font color="Maroon">M</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/>





<b>assume </b><a NAME="E1:115"/><i><font color="Green">E46</font></i>: 
( <font color="Maroon">M</font> <a href="zf_model.html#R2">|=</a> <font color="Maroon">p</font> <a href="zf_lang.html#K11">=&gt;</a> <font color="Maroon">q</font> &amp; <font color="Maroon">M</font> <a href="zf_model.html#R2">|=</a> <font color="Maroon">p</font> )
 ;<br/>

<b>let </b><font color="Maroon">v</font> be   <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">M</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="zf_model.html#D5">ZF_MODEL:def 5</a><br/>

<a NAME="E2:115"/>
( <font color="Maroon">M</font>,<font color="Maroon">v</font> <a href="zf_model.html#R1">|=</a> <font color="Maroon">p</font> <a href="zf_lang.html#K11">=&gt;</a> <font color="Maroon">q</font> &amp; <font color="Maroon">M</font>,<font color="Maroon">v</font> <a href="zf_model.html#R1">|=</a> <font color="Maroon">p</font> )
 
<b>by </b><i><a class="ref" href="zf_lang1.html#T1" target="_self">Th1</a>, <a class="ref" href="zf_model.html#D5">ZF_MODEL:def 5</a></i>;<br/>
<b>hence </b><a NAME="E3:115"/>
<font color="Maroon">M</font>,<font color="Maroon">v</font> <a href="zf_model.html#R1">|=</a> <font color="Maroon">q</font>
 <b>by </b><i><a class="ref" href="zf_model.html#T18">ZF_MODEL:18</a></i>;<br/>


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