<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">H</font> be   <a href="zf_lang.html#NM2">ZF-formula</a>;<br/>

<b>assume </b><a NAME="E1:107"/>
<font color="Maroon">H</font> is <a href="zf_lang.html#V5" target="_self">conjunctive</a>
 ;<br/>

<a NAME="E2:107"/><b>then </b>
<font color="Maroon">H</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K21" target="_self">the_left_argument_of</a> <font color="Maroon">H</font></span>)</span> <a href="zf_lang.html#K7" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K22" target="_self">the_right_argument_of</a> <font color="Maroon">H</font></span>)</span>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:107"/>
 <a href="zf_lang.html#K29" target="_self">Subformulae</a> <font color="Maroon">H</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_lang.html#K29" target="_self">Subformulae</a> <span class="p3">(<span class="default"><a href="zf_lang.html#K21" target="_self">the_left_argument_of</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="xboole_0.html#K2">\/</a> <span class="p2">(<span class="default"><a href="zf_lang.html#K29" target="_self">Subformulae</a> <span class="p3">(<span class="default"><a href="zf_lang.html#K22" target="_self">the_right_argument_of</a> <font color="Maroon">H</font></span>)</span></span>)</span></span>)</span> <a href="xboole_0.html#K2">\/</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><font color="Maroon">H</font></span><a href="tarski.html#K1">}</a></span>
 <b>by </b><i><a class="ref" href="zf_lang.html#T39" target="_self">Th39</a></i>;<br/>


</div>
