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

<b>let </b><font color="Maroon">D</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">UN</font> be   <a href="classes2.html#NM1">Universe</a>;<br/>



<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="63_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">f</font> be   <a href="binop_1.html#NM2">BinOp</a> of <font color="Maroon">D</font>;<br/><b>assume </b><a NAME="E1:63_1"/><i><font color="Green">E29</font></i>: 
<font color="Maroon">D</font> <a href="hidden.html#R2">in</a> <font color="Maroon">UN</font>
 ;<br/><a NAME="E2:63_1"/><b>then </b>
<span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">D</font>,<font color="Maroon">D</font></span><a href="zfmisc_1.html#K2">:]</a></span> <a href="hidden.html#R2">in</a> <font color="Maroon">UN</font>
 <b>by </b><i><a class="ref" href="classes2.html#T67">CLASSES2:67</a></i>;<br/><a NAME="E3:63_1"/><b>then </b><i><font color="Green">E33</font></i>: 
 <a href="funct_2.html#K1">Funcs</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">D</font>,<font color="Maroon">D</font></span><a href="zfmisc_1.html#K2">:]</a></span>,<font color="Maroon">D</font> <a href="hidden.html#R2">in</a> <font color="Maroon">UN</font>
 <b>by </b><i><a class="ref" href="mod_2.html#T8" target="_self">Th8</a>, <a class="ref" href="classes2.html#T67">CLASSES2:67</a></i>;<br/><a NAME="E4:63_1"/>
<font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">D</font>,<font color="Maroon">D</font></span><a href="zfmisc_1.html#K2">:]</a></span>,<font color="Maroon">D</font>
 <b>by </b><i><a class="ref" href="funct_2.html#T11">FUNCT_2:11</a></i>;<br/><b>hence </b><a NAME="E5:63_1"/>
<font color="Maroon">f</font> <a href="hidden.html#R2">in</a> <font color="Maroon">UN</font>
 <b>by </b><i>, <a class="ref" href="grcat_1.html#T4">GRCAT_1:4</a></i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E2:63"/>
( ( for <font color="Olive">f</font> being  <a href="binop_1.html#NM2">BinOp</a> of <font color="Maroon">D</font>  st <font color="Maroon">D</font> <a href="hidden.html#R2">in</a> <font color="Maroon">UN</font> holds <br/><font color="Olive">f</font> <a href="hidden.html#R2">in</a> <font color="Maroon">UN</font> ) &amp; ( for <font color="Olive">f</font> being  <a href="binop_1.html#NM1">UnOp</a> of <font color="Maroon">D</font>  st <font color="Maroon">D</font> <a href="hidden.html#R2">in</a> <font color="Maroon">UN</font> holds <br/><font color="Olive">f</font> <a href="hidden.html#R2">in</a> <font color="Maroon">UN</font> ) )
 <b>by </b><i/>;<br/>


</div>
