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

<div><b>hereby </b>
<div class="add"><b>assume </b><a NAME="E1:2_1_1_1"/>
not <font color="Maroon">S</font> is <a href="msualg_1.html#V2">void</a>
 ;<br/><b>defpred </b><font color="Maroon">S<sub>1</sub></font>[  <a href="msualg_1.html#NM1">SortSymbol</a> of <font color="Maroon">S</font>] <b>means </b><font color="Maroon">a<sub>1</sub></font> is <a href="msualg_2.html#V1">with_const_op</a>;<br/><a NAME="E2:2_1_1_1"/>
<span class="p1">{<span class="default"> <font color="Olive">v</font> where <font color="Olive">v</font> is   <a href="msualg_1.html#NM1">SortSymbol</a> of <font color="Maroon">S</font> : <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">v</font>] </span>}</span>  is   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">S</font>
 <b>from </b><i><a class="ref" href="domain_1.html#S7">DOMAIN_1:sch 7</a>();<br/></i><b>hence </b><a NAME="E3:2_1_1_1"/>
<span class="p1">{<span class="default"> <font color="Olive">v</font> where <font color="Olive">v</font> is   <a href="msualg_1.html#NM1">SortSymbol</a> of <font color="Maroon">S</font> : <font color="Olive">v</font> is <a href="msualg_2.html#V1">with_const_op</a> </span>}</span>  is   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">S</font>
 ;<br/></div>
<b>end;</b></div>

<b>assume </b><a NAME="E2:2_1_1"/>
<font color="Maroon">S</font> is <a href="msualg_1.html#V2">void</a>
 ;<br/>

<b>thus </b><a NAME="E3:2_1_1"/>
 <a href="xboole_0.html#K1">{}</a>  is   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">S</font>
 <b>by </b><i><a class="ref" href="subset_1.html#T4">SUBSET_1:4</a></i>;<br/>


</div>
