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

<b>assume </b><a NAME="E1:3"/>
<font color="Maroon">f</font> is <a href="realset1.html#V1">trivial</a>
 ;<br/>

<a NAME="E2:3"/><b>then </b>
 <a href="finseq_1.html#K4">dom</a> <font color="Maroon">f</font> is <a href="realset1.html#V1">trivial</a>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:3"/>
 <a href="finseq_1.html#K3">len</a> <font color="Maroon">f</font> is <a href="realset1.html#V1">trivial</a>
 <b>by </b><i/>;<br/>


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