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

<b>let </b><font color="Maroon">U1</font> be   <a href="unialg_1.html#NM2">Universal_Algebra</a>;<br/><b>let </b><font color="Maroon">U2</font> be   <a href="unialg_1.html#NM2">Universal_Algebra</a>;<br/><b>let </b><font color="Maroon">U3</font> be   <a href="unialg_1.html#NM2">Universal_Algebra</a>;<br/>





<b>assume </b><a NAME="E1:9"/>
( <font color="Maroon">U1</font>,<font color="Maroon">U2</font> <a href="unialg_2.html#R1" target="_self">are_similar</a>  &amp; <font color="Maroon">U2</font>,<font color="Maroon">U3</font> <a href="unialg_2.html#R1" target="_self">are_similar</a>  )
 ;<br/>

<a NAME="E2:9"/><b>then </b>
(  <a href="unialg_1.html#K4">signature</a> <font color="Maroon">U1</font> <a href="hidden.html#R1">=</a>  <a href="unialg_1.html#K4">signature</a> <font color="Maroon">U2</font> &amp;  <a href="unialg_1.html#K4">signature</a> <font color="Maroon">U2</font> <a href="hidden.html#R1">=</a>  <a href="unialg_1.html#K4">signature</a> <font color="Maroon">U3</font> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:9"/>
<font color="Maroon">U1</font>,<font color="Maroon">U3</font> <a href="unialg_2.html#R1" target="_self">are_similar</a> 
 <b>by </b><i/>;<br/>


</div>
