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

<b>let </b><font color="Maroon" title="c1">S</font> be   <a href="catalg_1.html#NM1" title="CATALG_1:NM.1">Signature</a>;<br/><b>let </b><font color="Maroon" title="c2">E</font> be    <a href="algspec1.html#M2" title="ALGSPEC1:mode.2">Extension</a> of <font color="Maroon" title="c1">S</font>;<br/><b>let </b><font color="Maroon" title="c3">A</font> be    <a href="algspec1.html#M4" title="ALGSPEC1:mode.4">Algebra</a> of <font color="Maroon" title="c2">E</font>;<br/>





<b>consider </b><font color="Maroon" title="c4">E'</font> being  non <a href="msualg_1.html#V2" title="MSUALG_1:attr.2">void</a>  <a href="algspec1.html#M2" title="ALGSPEC1:mode.2">Extension</a> of <font color="Maroon" title="c2">E</font><b> such that </b><br/><a NAME="E2:66"/><i><font color="Green" title="E49">A1</font></i>: 
<font color="Maroon" title="c3">A</font> is  <a href="msualg_6.html#V1" title="MSUALG_6:attr.1">feasible</a>  <a href="msualg_1.html#L3" title="MSUALG_1:struct.3">MSAlgebra</a> of <font color="Maroon" title="c4">E'</font>
 <b>by </b><i><a class="ref" href="algspec1.html#D7" target="_self" title="ALGSPEC1:def.7">Def7</a></i>;<br/>
<a NAME="E3:66"/>
<font color="Maroon" title="c4">E'</font> is    <a href="algspec1.html#M2" title="ALGSPEC1:mode.2">Extension</a> of <font color="Maroon" title="c1">S</font>
 
<b>by </b><i><a class="ref" href="algspec1.html#T48" target="_self" title="ALGSPEC1:th.48">Th48</a></i>;<br/>
<b>hence </b><a NAME="E4:66"/>
<font color="Maroon" title="c3">A</font> is    <a href="algspec1.html#M4" title="ALGSPEC1:mode.4">Algebra</a> of <font color="Maroon" title="c1">S</font>
 <b>by </b><i><a class="txt" href="algspec1.html#E2:66"><i><font color="Green" title="E49">A1</font></i></a>, <a class="ref" href="algspec1.html#D7" target="_self" title="ALGSPEC1:def.7">Def7</a></i>;<br/>


</div>
