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<b>let </b><font color="Maroon">G1</font> be   <a href="glib_000.html#NM2">_Graph</a>;<br/><b>let </b><font color="Maroon">G2</font> be    <a href="glib_000.html#M2">Subgraph</a> of <font color="Maroon">G1</font>;<br/><b>let </b><font color="Maroon">v1</font> be   <a href="glib_000.html#NM10">Vertex</a> of <font color="Maroon">G1</font>;<br/><b>let </b><font color="Maroon">v2</font> be   <a href="glib_000.html#NM10">Vertex</a> of <font color="Maroon">G2</font>;<br/>







<b>assume </b><a NAME="E1:67"/><i><font color="Green">E41</font></i>: 
<font color="Maroon">v1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">v2</font>
 ;<br/>

<b>let </b><font color="Maroon">v</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E2:67"/>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <font color="Maroon">G2</font> <a href="glib_002.html#K1" target="_self">.reachableFrom</a> <font color="Maroon">v2</font>
 ;<br/>

<b>then consider </b><font color="Maroon">W</font> being    <a href="glib_001.html#M3">Walk</a> of <font color="Maroon">G2</font><b> such that </b><br/><a NAME="E4:67"/><i><font color="Green">E42</font></i>: 
<font color="Maroon">W</font> <a href="glib_001.html#R1">is_Walk_from</a> <font color="Maroon">v2</font>,<font color="Maroon">v</font>
 <b>by </b><i/>;<br/>
<b>reconsider </b><font color="Maroon">W2</font> = <font color="Maroon">W</font> as    <a href="glib_001.html#M3">Walk</a> of <font color="Maroon">G1</font> <b>by </b><i><a class="ref" href="glib_001.html#T168">GLIB_001:168</a></i>;<br/>
<a NAME="E6:67"/>
<font color="Maroon">W2</font> <a href="glib_001.html#R1">is_Walk_from</a> <font color="Maroon">v1</font>,<font color="Maroon">v</font>
 
<b>by </b><i>, , <a class="ref" href="glib_001.html#T20">GLIB_001:20</a></i>;<br/>
<b>hence </b><a NAME="E7:67"/>
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <font color="Maroon">G1</font> <a href="glib_002.html#K1" target="_self">.reachableFrom</a> <font color="Maroon">v1</font>
 <b>by </b><i/>;<br/>


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