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<b>let </b><font color="Maroon">UA</font> be   <a href="unialg_1.html#NM2">Universal_Algebra</a>;<br/><b>let </b><font color="Maroon">f1</font> be    <a href="fraenkel.html#M2">Element</a> of  <a href="autalg_1.html#K1" target="_self">UAAut</a> <font color="Maroon">UA</font>, <font color="Maroon">f2</font> be    <a href="fraenkel.html#M2">Element</a> of  <a href="autalg_1.html#K1" target="_self">UAAut</a> <font color="Maroon">UA</font>;<br/>



<a NAME="E1:8"/>
( <font color="Maroon">f1</font> <a href="alg_1.html#R4">is_isomorphism</a> <font color="Maroon">UA</font>,<font color="Maroon">UA</font> &amp; <font color="Maroon">f2</font> <a href="alg_1.html#R4">is_isomorphism</a> <font color="Maroon">UA</font>,<font color="Maroon">UA</font> )
 
<b>by </b><i/>;<br/>
<a NAME="E2:8"/><b>then </b>
<font color="Maroon">f1</font> <a href="partfun1.html#K1">*</a> <font color="Maroon">f2</font> <a href="alg_1.html#R4">is_isomorphism</a> <font color="Maroon">UA</font>,<font color="Maroon">UA</font>
 
<b>by </b><i><a class="ref" href="alg_1.html#T12">ALG_1:12</a></i>;<br/>
<b>hence </b><a NAME="E3:8"/>
<font color="Maroon">f1</font> <a href="partfun1.html#K1">*</a> <font color="Maroon">f2</font> <a href="hidden.html#R2">in</a>  <a href="autalg_1.html#K1" target="_self">UAAut</a> <font color="Maroon">UA</font>
 <b>by </b><i/>;<br/>


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