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<b>let </b><font color="Maroon">p</font> be    <a href="graph_1.html#M2">Chain</a> of <font color="Maroon">G</font>;<br/>

<b>assume </b><a NAME="E1:78_1_1"/><i><font color="Green">E30</font></i>: 
<font color="Maroon">p</font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>

<a NAME="E2:78_1_1"/>
for <font color="Olive">n</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a>   st 1 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Olive">n</font> &amp; <font color="Olive">n</font> <a href="xxreal_0.html#NR3" target="_self">&lt;</a>  <a href="finseq_1.html#K3">len</a> <font color="Maroon">p</font> holds <br/>the <a href="graph_1.html#U3">Source</a> of <font color="Maroon">G</font> <a href="funct_1.html#K1">.</a> <span class="p1">(<span class="default"><font color="Maroon">p</font> <a href="funct_1.html#K1">.</a> <span class="p2">(<span class="default"><font color="Olive">n</font> <a href="nat_1.html#K1">+</a> 1</span>)</span></span>)</span> <a href="hidden.html#R1">=</a> the <a href="graph_1.html#U4">Target</a> of <font color="Maroon">G</font> <a href="funct_1.html#K1">.</a> <span class="p1">(<span class="default"><font color="Maroon">p</font> <a href="funct_1.html#K1">.</a> <font color="Olive">n</font></span>)</span>
 
<b>by </b><i>, <a class="ref" href="finseq_1.html#T25">FINSEQ_1:25</a></i>;<br/>
<b>hence </b><a NAME="E3:78_1_1"/>
<font color="Maroon">p</font> is <a href="graph_1.html#V8">oriented</a>
 <b>by </b><i><a class="ref" href="graph_1.html#D12">GRAPH_1:def 12</a></i>;<br/>


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