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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="struct_0.html#V3">empty</a> non <a href="msualg_1.html#V2">void</a>  <a href="msualg_1.html#L1">ManySortedSign</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be  <a href="msualg_1.html#V5">non-empty</a>  <a href="msualg_1.html#L3">MSAlgebra</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="autalg_1.html#M2" target="_self">Element</a> of  <a href="autalg_1.html#K4" target="_self">MSAAut</a> <font color="Maroon">c<sub>2</sub></font>;<br/>





<a NAME="E1:38"/>
<font color="Maroon">c<sub>3</sub></font> <a href="msualg_3.html#R4">is_isomorphism</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="autalg_1.html#D7" target="_self">Def7</a></i>;<br/>
<a NAME="E2:38"/><b>then </b>
<font color="Maroon">c<sub>3</sub></font> <a href="msualg_3.html#K4">""</a>  <a href="msualg_3.html#R4">is_isomorphism</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="msualg_3.html#T14">MSUALG_3:14</a></i>;<br/>
<b>hence </b><a NAME="E3:38"/>
<font color="Maroon">c<sub>3</sub></font> <a href="msualg_3.html#K4">""</a>  <a href="hidden.html#R2">in</a>  <a href="autalg_1.html#K4" target="_self">MSAAut</a> <font color="Maroon">c<sub>2</sub></font>
 <b>by </b><i><a class="ref" href="autalg_1.html#D7" target="_self">Def7</a></i>;<br/>


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