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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="partfun1.html#NM1">PartFunc</a> of <a href="numbers.html#K5">NAT</a>  <a href="finseq_2.html#K3">*</a> , <a href="numbers.html#K5">NAT</a> ;<br/>

<a NAME="E1:37_1_1"/><i><font color="Green">E20</font></i>: 
 <a href="relat_1.html#K2">rng</a> <font color="Maroon">c<sub>1</sub></font> <a href="tarski.html#R1">c=</a>  <a href="numbers.html#K5">NAT</a> 
 
<b>by </b><i><a class="ref" href="relset_1.html#T12">RELSET_1:12</a></i>;<br/>
<a NAME="E2:37_1_1"/>
 <a href="relset_1.html#K4">dom</a> <font color="Maroon">c<sub>1</sub></font> <a href="tarski.html#R1">c=</a> <a href="numbers.html#K5">NAT</a>  <a href="finseq_2.html#K3">*</a> 
 
;<br/>
<b>hence </b><a NAME="E3:37_1_1"/>
( <font color="Maroon">c<sub>1</sub></font> is <a href="seqm_3.html#V6">to-naturals</a> &amp; <font color="Maroon">c<sub>1</sub></font> is <a href="comput_1.html#V2" target="_self">from-natural-fseqs</a> )
 <b>by </b><i><a class="txt" href="comput_1.html#E1:37_1_1"><i><font color="Green">E20</font></i></a>, <a class="ref" href="comput_1.html#D2" target="_self">Def2</a>, <a class="ref" href="seqm_3.html#D8">SEQM_3:def 8</a></i>;<br/>


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