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<a NAME="E1:42_1_1"/>
 <a href="xboole_0.html#K1">{}</a>  is    <a href="finseq_1.html#M2" target="_self">FinSequence</a> of <font color="Maroon">D</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:42_1_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being   <a href="finseq_1.html#M2" target="_self">FinSequence</a> of <font color="Maroon">D</font> st <font color="Olive">b<sub>1</sub></font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>


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