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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="finseq_1.html#NM1">FinSequence</a>;<br/>

<div><b>hereby </b>
<div class="add"><b>assume </b><a NAME="E1:1_1"/>
<font color="Maroon">c<sub>1</sub></font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/><b>then reconsider </b><font color="Maroon">c<sub>2</sub></font> = <font color="Maroon">c<sub>1</sub></font> as  <a href="xboole_0.html#V1">empty</a> <a href="finseq_1.html#NM1">FinSequence</a> ;<br/><a NAME="E3:1_1"/>
 <a href="finseq_5.html#K3">Rev</a> <font color="Maroon">c<sub>2</sub></font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/><b>hence </b><a NAME="E4:1_1"/>
 <a href="finseq_5.html#K3">Rev</a> <font color="Maroon">c<sub>1</sub></font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/></div>
<b>end;</b></div>

<b>assume </b><a NAME="E2:1"/>
 <a href="finseq_5.html#K3">Rev</a> <font color="Maroon">c<sub>1</sub></font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>

<b>then reconsider </b><font color="Maroon">c<sub>2</sub></font> =  <a href="finseq_5.html#K3">Rev</a> <font color="Maroon">c<sub>1</sub></font> as  <a href="xboole_0.html#V1">empty</a> <a href="finseq_1.html#NM1">FinSequence</a> ;<br/>
<a NAME="E4:1"/>
 <a href="finseq_5.html#K3">Rev</a> <font color="Maroon">c<sub>2</sub></font> is <a href="xboole_0.html#V1">empty</a>
 
;<br/>
<b>hence </b><a NAME="E5:1"/>
<font color="Maroon">c<sub>1</sub></font> is <a href="xboole_0.html#V1">empty</a>
 <b>by </b><i><a class="ref" href="finseq_6.html#T29">FINSEQ_6:29</a></i>;<br/>


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