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<b>let </b><font color="Maroon">G</font> be   <a href="glib_000.html#NM2">_Graph</a>;<br/>

<b>assume </b><a NAME="E1:23_1_1"/><i><font color="Green">E28</font></i>: 
<font color="Maroon">G</font> is <a href="glib_000.html#V5" target="_self">non-multi</a>
 ;<br/>

<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="23_1_1_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">e1</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">e2</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">v1</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">v2</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>assume </b><a NAME="E1:23_1_1_1"/>
( <font color="Maroon">e1</font> <a href="glib_000.html#R2" target="_self">DJoins</a> <font color="Maroon">v1</font>,<font color="Maroon">v2</font>,<font color="Maroon">G</font> &amp; <font color="Maroon">e2</font> <a href="glib_000.html#R2" target="_self">DJoins</a> <font color="Maroon">v1</font>,<font color="Maroon">v2</font>,<font color="Maroon">G</font> )
 ;<br/><a NAME="E2:23_1_1_1"/><b>then </b>
( <font color="Maroon">e1</font> <a href="glib_000.html#R1" target="_self">Joins</a> <font color="Maroon">v1</font>,<font color="Maroon">v2</font>,<font color="Maroon">G</font> &amp; <font color="Maroon">e2</font> <a href="glib_000.html#R1" target="_self">Joins</a> <font color="Maroon">v1</font>,<font color="Maroon">v2</font>,<font color="Maroon">G</font> )
 <b>by </b><i/>;<br/><b>hence </b><a NAME="E3:23_1_1_1"/>
<font color="Maroon">e1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">e2</font>
 <b>by </b><i>, </i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E3:23_1_1"/>
<font color="Maroon">G</font> is <a href="glib_000.html#V6" target="_self">non-Dmulti</a>
 <b>by </b><i/>;<br/>


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