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

<b>consider </b><font color="Maroon">U2</font> being   <a href="osalg_2.html#NM3">OSSubAlgebra</a> of <font color="Maroon">U1</font>;<br/>
<b>take </b>
<font color="Maroon">U2</font>
;<br/>

<b>thus </b><a NAME="E2:20_1_1"/>
<font color="Maroon">U2</font> is <a href="osalg_1.html#V13">monotone</a>
 <b>by </b><i/>;<br/>


</div>
