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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="catalg_1.html#NM1">Signature</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="algspec1.html#M2" target="_self">Extension</a> of <font color="Maroon">c<sub>1</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>3</sub></font> be    <a href="algspec1.html#M4" target="_self">Algebra</a> of <font color="Maroon">c<sub>2</sub></font>;<br/>





<b>consider </b><font color="Maroon">c<sub>4</sub></font> being  non <a href="msualg_1.html#V2">void</a>  <a href="algspec1.html#M2" target="_self">Extension</a> of <font color="Maroon">c<sub>2</sub></font><b> such that </b><br/><a NAME="E2:67"/><i><font color="Green">E50</font></i>: 
<font color="Maroon">c<sub>3</sub></font> is  <a href="msualg_6.html#V1">feasible</a>  <a href="msualg_1.html#L3">MSAlgebra</a> of <font color="Maroon">c<sub>4</sub></font>
 <b>by </b><i><a class="ref" href="algspec1.html#D7" target="_self">Def7</a></i>;<br/>
<a NAME="E3:67"/>
<font color="Maroon">c<sub>4</sub></font> is    <a href="algspec1.html#M2" target="_self">Extension</a> of <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="algspec1.html#T48" target="_self">Th48</a></i>;<br/>
<b>hence </b><a NAME="E4:67"/>
<font color="Maroon">c<sub>3</sub></font> is    <a href="algspec1.html#M4" target="_self">Algebra</a> of <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="algspec1.html#E2:67"><i><font color="Green">E50</font></i></a>, <a class="ref" href="algspec1.html#D7" target="_self">Def7</a></i>;<br/>


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