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<b>let </b><font color="Maroon">Fr</font> be   <a href="afinsq_1.html#NM2">XFinSequence</a> of  <a href="numbers.html#K1">REAL</a> ;<br/>

<b>assume </b><a NAME="E1:60"/>
 <a href="afinsq_1.html#K2">dom</a> <font color="Maroon">Fr</font> <a href="hidden.html#R1">=</a> 0
 ;<br/>

<a NAME="E2:60"/><b>then </b>
 <a href="afinsq_1.html#K1">len</a> <font color="Maroon">Fr</font> <a href="hidden.html#R1">=</a> 0
 
<b>by </b><i><a class="ref" href="afinsq_1.html#D1">AFINSQ_1:def 1</a></i>;<br/>
<b>hence </b><a NAME="E3:60"/>
 <a href="catalan2.html#K4" target="_self">Sum</a> <font color="Maroon">Fr</font> <a href="hidden.html#R1">=</a> 0
 <b>by </b><i><a class="ref" href="binop_2.html#T2">BINOP_2:2</a>, <a class="ref" href="stirl2_1.html#D3">STIRL2_1:def 3</a></i>;<br/>


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