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<b>let </b><font color="Maroon">f</font> be  non <a href="xboole_0.html#V1">empty</a> <a href="finseq_1.html#NM1">FinSequence</a>;<br/><b>let </b><font color="Maroon">g</font> be   <a href="finseq_1.html#NM1">FinSequence</a>;<br/>



<a NAME="E1:46"/>
 <a href="finseq_1.html#K3">len</a> <font color="Maroon">g</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="graph_2.html#K3">^'</a> <font color="Maroon">g</font></span>)</span>
 
<b>by </b><i><a class="ref" href="topreal8.html#T9">TOPREAL8:9</a></i>;<br/>
<b>hence </b><a NAME="E2:46"/>
 <a href="finseq_1.html#K4">dom</a> <font color="Maroon">g</font> <a href="tarski.html#R1">c=</a>  <a href="finseq_1.html#K4">dom</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="graph_2.html#K3">^'</a> <font color="Maroon">g</font></span>)</span>
 <b>by </b><i><a class="ref" href="finseq_3.html#T32">FINSEQ_3:32</a></i>;<br/>


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