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<b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="finseq_2.html#M1">FinSequenceSet</a> of <font color="Maroon">c<sub>1</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>3</sub></font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="fraenkel.html#D1">FRAENKEL:def 1</a><br/>



<b>thus </b><a NAME="E1:14_1_1"/>
( <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>2</sub></font> implies <font color="Maroon">c<sub>3</sub></font> is   <a href="funct_1.html#NM1">Function</a> )
 <b>by </b><i><a class="ref" href="finseq_2.html#D3">FINSEQ_2:def 3</a></i>;<br/>


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