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<b>let </b><font color="Maroon" title="c1">H</font> be   <a href="zf_lang.html#NM2" title="ZF_LANG:NM.2">ZF-formula</a>;<br/><b>let </b><font color="Maroon" title="c2">x</font>, <font color="Maroon" title="c3">y</font>, <font color="Maroon" title="c4">z</font> be   <a href="zf_lang.html#NM1" title="ZF_LANG:NM.1">Variable</a>;<br/><b>let </b><font color="Maroon" title="c5">M</font> be  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>









<a NAME="E1:93"/>
( ( <font color="Maroon" title="c5">M</font> <a href="zf_model.html#R2" title="ZF_MODEL:pred.2">|=</a> <font color="Maroon" title="c1">H</font> implies <font color="Maroon" title="c5">M</font> <a href="zf_model.html#R2" title="ZF_MODEL:pred.2">|=</a>  <a href="zf_lang.html#K15" title="ZF_LANG:func.15">Ex</a> <font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c1">H</font> ) &amp; ( <font color="Maroon" title="c5">M</font> <a href="zf_model.html#R2" title="ZF_MODEL:pred.2">|=</a>  <a href="zf_lang.html#K15" title="ZF_LANG:func.15">Ex</a> <font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c1">H</font> implies <font color="Maroon" title="c5">M</font> <a href="zf_model.html#R2" title="ZF_MODEL:pred.2">|=</a>  <a href="zf_lang.html#K17" title="ZF_LANG:func.17">Ex</a> <font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c1">H</font> ) )
 
<b>by </b><i><a class="ref" href="zf_lang1.html#T105" target="_self" title="ZF_LANG1:th.105">Th105</a>, <a class="ref" href="zf_lang1.html#T107" target="_self" title="ZF_LANG1:th.107">Th107</a></i>;<br/>
<b>hence </b><a NAME="E2:93"/>
( <font color="Maroon" title="c5">M</font> <a href="zf_model.html#R2" title="ZF_MODEL:pred.2">|=</a> <font color="Maroon" title="c1">H</font> implies <font color="Maroon" title="c5">M</font> <a href="zf_model.html#R2" title="ZF_MODEL:pred.2">|=</a>  <a href="zf_lang.html#K17" title="ZF_LANG:func.17">Ex</a> <font color="Maroon" title="c2">x</font>,<font color="Maroon" title="c3">y</font>,<font color="Maroon" title="c4">z</font>,<font color="Maroon" title="c1">H</font> )
 ;<br/>


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