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<b>take </b><font color="Maroon">f</font> =  <a href="xboole_0.html#K1">{}</a> ;<br/>

<b>thus </b><a NAME="E1:25_1_1"/>
(  <a href="finseq_1.html#K4">dom</a> <font color="Maroon">f</font> <a href="tarski.html#R1">c=</a> <a href="numbers.html#K5">NAT</a>  <a href="finseq_2.html#K3">*</a>  &amp;  <a href="relat_1.html#K2">rng</a> <font color="Maroon">f</font> <a href="tarski.html#R1">c=</a>  <a href="numbers.html#K5">NAT</a>  )
 <b>by </b><i><a class="ref" href="xboole_1.html#T2">XBOOLE_1:2</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="seqm_3.html#D8">SEQM_3:def 8</a>,<a class="ref" href="comput_1.html#D2" target="_self">COMPUT_1:def 2</a><br/>


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