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<span class="kw">let </span><font color="Maroon" title="c1">s</font> be   non  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>   <a href="finset_1.html#V1" title="FINSET_1:attr.1">finite</a>   <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide">  <a href="card_1.html#K5" title="CARD_1:func.5">card</a> <span class="p1">(<span class="default"><a href="cardfin2.html#K2" title="CARDFIN2:func.2">derangements</a> <font color="Maroon" title="c1">s</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="cardfin2.html#K1" title="CARDFIN2:func.1">round</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="card_1.html#K5" title="CARD_1:func.5">card</a> <font color="Maroon" title="c1">s</font></span>)</span> <a href="newton.html#K5" title="NEWTON:func.5">!</a></span>)</span> <a href="binop_2.html#K12" title="BINOP_2:func.12">/</a> <a href="power.html#K8" title="POWER:func.8">number_e</a></span>)</span></span><br/>

<a NAME="E1:15"/>
<span class="p1"><a href="complex1.html#K17" title="COMPLEX1:func.17">|.</a><span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="card_1.html#K5" title="CARD_1:func.5">card</a> <span class="p4">(<span class="default"><a href="cardfin2.html#K2" title="CARDFIN2:func.2">derangements</a> <font color="Maroon" title="c1">s</font></span>)</span></span>)</span> <a href="binop_2.html#K10" title="BINOP_2:func.10">-</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><span class="p5">(<span class="default"><a href="card_1.html#K5" title="CARD_1:func.5">card</a> <font color="Maroon" title="c1">s</font></span>)</span> <a href="newton.html#K5" title="NEWTON:func.5">!</a></span>)</span> <a href="binop_2.html#K12" title="BINOP_2:func.12">/</a> <a href="power.html#K8" title="POWER:func.8">number_e</a></span>)</span></span>)</span></span><a href="complex1.html#K17" title="COMPLEX1:func.17">.|</a></span> <a href="xxreal_0.html#NR3" title="XXREAL_0:NR.3">&lt;</a> 1 <a href="binop_2.html#K18" title="BINOP_2:func.18">/</a> 2
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="cardfin2.html#T9" target="_self" title="CARDFIN2:th.9">Th9</a></span>;<br/>
<span class="kw">hence </span><a NAME="E2:15"/>
 <a href="card_1.html#K5" title="CARD_1:func.5">card</a> <span class="p1">(<span class="default"><a href="cardfin2.html#K2" title="CARDFIN2:func.2">derangements</a> <font color="Maroon" title="c1">s</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="cardfin2.html#K1" title="CARDFIN2:func.1">round</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="card_1.html#K5" title="CARD_1:func.5">card</a> <font color="Maroon" title="c1">s</font></span>)</span> <a href="newton.html#K5" title="NEWTON:func.5">!</a></span>)</span> <a href="binop_2.html#K12" title="BINOP_2:func.12">/</a> <a href="power.html#K8" title="POWER:func.8">number_e</a></span>)</span>
 <span class="kw">by</span> <span class="lab"><a class="ref" href="cardfin2.html#T4" target="_self" title="CARDFIN2:th.4">Th4</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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