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 <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <span class="p1">(<span class="default"><a href="msualg_1.html#K1" title="MSUALG_1:func.1">the_arity_of</a> <span class="p2">(<span class="default"><a href="abcmiz_a.html#K14" title="ABCMIZ_A:func.14">@</a> <a href="abcmiz_a.html#K8" title="ABCMIZ_A:func.8">set-constr</a> </span>)</span></span>)</span> = 
 <a href="card_1.html#K5" title="CARD_1:func.5">card</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="abcmiz_a.html#K8" title="ABCMIZ_A:func.8">set-constr</a>  <a href="abcmiz_1.html#K24" title="ABCMIZ_1:func.24">`2</a> </span>)</span> <a href="abcmiz_1.html#K21" title="ABCMIZ_1:func.21">`1</a> </span>)</span>
<span class="kw">by</span> <span class="lab"><a class="ref" href="abcmiz_1.html#D24" title="ABCMIZ_1:def.24">ABCMIZ_1:def 24</a></span>
<br/>.= 
 <a href="card_1.html#K1" title="CARD_1:func.1">card</a> <span class="p1">(<span class="default"><span class="p2"><a href="tarski.html#K4" title="TARSKI:func.4">[</a><span class="default"><a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> ,<a href="numbers.html#K6" title="NUMBERS:func.6">0</a> </span><a href="tarski.html#K4" title="TARSKI:func.4">]</a></span> <a href="mcart_1.html#K1" title="MCART_1:func.1">`1</a> </span>)</span>
<span class="kw">by</span> <span class="lab"><a class="ref" href="mcart_1.html#T7" title="MCART_1:th.7">MCART_1:7</a></span>
<br/>.= 
 <a href="card_1.html#K5" title="CARD_1:func.5">card</a> <a href="numbers.html#K6" title="NUMBERS:func.6">0</a> 
<span class="kw">by</span> <span class="lab"><a class="ref" href="mcart_1.html#T7" title="MCART_1:th.7">MCART_1:7</a></span>
;<br/>
<span class="kw">hence </span><a NAME="E2:75_1_1"/>
 <a href="msualg_1.html#K1" title="MSUALG_1:func.1">the_arity_of</a> <span class="p1">(<span class="default"><a href="abcmiz_a.html#K14" title="ABCMIZ_A:func.14">@</a> <a href="abcmiz_a.html#K8" title="ABCMIZ_A:func.8">set-constr</a> </span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> 
 ; <span class="comment"><font color="Red">:: according to </font></span><a class="ref" href="abcmiz_a.html#D13" target="_self" title="ABCMIZ_A:def.13">ABCMIZ_A:def 13</a> <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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