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

<b>let </b><font color="Maroon" title="c2">M1</font>, <font color="Maroon" title="c3">M2</font> be   <a href="card_1.html#NM1" title="CARD_1:NM.1">Cardinal</a>;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:21_1_2"/><i><font color="Green" title="E13">A5</font></i>: 
(  <a href="card_1.html#K1" title="CARD_1:func.1">Card</a> <font color="Maroon" title="c1">X</font> <a href="card_1.html#NR2" title="CARD_1:NR.2">&lt;`</a> <font color="Maroon" title="c2">M1</font> &amp; ( for <font color="Olive" title="b1">M</font> being  <a href="card_1.html#NM1" title="CARD_1:NM.1">Cardinal</a>  st  <a href="card_1.html#K1" title="CARD_1:func.1">Card</a> <font color="Maroon" title="c1">X</font> <a href="card_1.html#NR2" title="CARD_1:NR.2">&lt;`</a> <font color="Olive" title="b1">M</font> holds <br/><font color="Maroon" title="c2">M1</font> <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a> <font color="Olive" title="b1">M</font> ) )
 <b>and </b><br/><a NAME="E2:21_1_2"/><i><font color="Green" title="E14">A6</font></i>: 
(  <a href="card_1.html#K1" title="CARD_1:func.1">Card</a> <font color="Maroon" title="c1">X</font> <a href="card_1.html#NR2" title="CARD_1:NR.2">&lt;`</a> <font color="Maroon" title="c3">M2</font> &amp; ( for <font color="Olive" title="b1">M</font> being  <a href="card_1.html#NM1" title="CARD_1:NM.1">Cardinal</a>  st  <a href="card_1.html#K1" title="CARD_1:func.1">Card</a> <font color="Maroon" title="c1">X</font> <a href="card_1.html#NR2" title="CARD_1:NR.2">&lt;`</a> <font color="Olive" title="b1">M</font> holds <br/><font color="Maroon" title="c3">M2</font> <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a> <font color="Olive" title="b1">M</font> ) )
 ;<br/>

<a NAME="E3:21_1_2"/>
( <font color="Maroon" title="c2">M1</font> <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a> <font color="Maroon" title="c3">M2</font> &amp; <font color="Maroon" title="c3">M2</font> <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a> <font color="Maroon" title="c2">M1</font> )
 
<b>by </b><i><a class="txt" href="card_1.html#E1:21_1_2"><i><font color="Green" title="E13">A5</font></i></a>, <a class="txt" href="card_1.html#E2:21_1_2"><i><font color="Green" title="E14">A6</font></i></a></i>;<br/>
<b>hence </b><a NAME="E4:21_1_2"/>
<font color="Maroon" title="c2">M1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">M2</font>
 <b>by </b><i><a class="ref" href="xboole_0.html#D10" title="XBOOLE_0:def.10">XBOOLE_0:def 10</a></i>;<br/>


</div>
