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<b>let </b><font color="Maroon">S</font> be   <a href="catalg_1.html#NM1">Signature</a>;<br/><b>let </b><font color="Maroon">E</font> be    <a href="algspec1.html#M2" target="_self">Extension</a> of <font color="Maroon">S</font>;<br/><b>let </b><font color="Maroon">A</font> be    <a href="algspec1.html#M4" target="_self">Algebra</a> of <font color="Maroon">E</font>;<br/>





<b>consider </b><font color="Maroon">E'</font> being  non <a href="msualg_1.html#V2">void</a>  <a href="algspec1.html#M2" target="_self">Extension</a> of <font color="Maroon">E</font><b> such that </b><br/><a NAME="E2:67"/><i><font color="Green">E25</font></i>: 
<font color="Maroon">A</font> is  <a href="msualg_6.html#V1">feasible</a>  <a href="msualg_1.html#L3">MSAlgebra</a> of <font color="Maroon">E'</font>
 <b>by </b><i/>;<br/>
<a NAME="E3:67"/>
<font color="Maroon">E'</font> is    <a href="algspec1.html#M2" target="_self">Extension</a> of <font color="Maroon">S</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E4:67"/>
<font color="Maroon">A</font> is    <a href="algspec1.html#M4" target="_self">Algebra</a> of <font color="Maroon">S</font>
 <b>by </b><i>, </i>;<br/>


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