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<b>let </b><font color="Maroon" title="c1">p</font>, <font color="Maroon" title="c2">q</font> be   <a href="zf_lang.html#NM2" title="ZF_LANG:NM.2">ZF-formula</a>;<br/><b>let </b><font color="Maroon" title="c3">x</font>, <font color="Maroon" title="c4">y</font>, <font color="Maroon" title="c5">z</font>, <font color="Maroon" title="c6">t</font>, <font color="Maroon" title="c7">s</font> be   <a href="zf_lang.html#NM1" title="ZF_LANG:NM.1">Variable</a>;<br/>













<a NAME="E1:12"/>
 <a href="zf_lang.html#K16" title="ZF_LANG:func.16">All</a> <font color="Maroon" title="c3">x</font>,<font color="Maroon" title="c4">y</font>,<font color="Maroon" title="c5">z</font>,<font color="Maroon" title="c1">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="zf_lang.html#K14" title="ZF_LANG:func.14">All</a> <font color="Maroon" title="c3">x</font>,<font color="Maroon" title="c4">y</font>,<span class="p1">(<span class="default"><a href="zf_lang.html#K8" title="ZF_LANG:func.8">All</a> <font color="Maroon" title="c5">z</font>,<font color="Maroon" title="c1">p</font></span>)</span>
 
;<br/>
<b>hence </b><a NAME="E2:12"/>
(  <a href="zf_lang.html#K16" title="ZF_LANG:func.16">All</a> <font color="Maroon" title="c3">x</font>,<font color="Maroon" title="c4">y</font>,<font color="Maroon" title="c5">z</font>,<font color="Maroon" title="c1">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="zf_lang.html#K14" title="ZF_LANG:func.14">All</a> <font color="Maroon" title="c6">t</font>,<font color="Maroon" title="c7">s</font>,<font color="Maroon" title="c2">q</font> implies ( <font color="Maroon" title="c3">x</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c6">t</font> &amp; <font color="Maroon" title="c4">y</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c7">s</font> &amp;  <a href="zf_lang.html#K8" title="ZF_LANG:func.8">All</a> <font color="Maroon" title="c5">z</font>,<font color="Maroon" title="c1">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">q</font> ) )
 <b>by </b><i><a class="ref" href="zf_lang1.html#T16" target="_self" title="ZF_LANG1:th.16">Th16</a></i>;<br/>


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