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<a NAME="E1:54"/>
 <a href="comput_1.html#K3">arity</a> <span class="p1">(<span class="default">1 <a href="comput_1.html#K8">proj</a> 1</span>)</span> <a href="hidden.html#R1">=</a> 1
 
<b>by </b><i><a class="ref" href="comput_1.html#T41">COMPUT_1:41</a></i>;<br/>
<a NAME="E2:54"/><b>then </b>
 <a href="relat_1.html#K1">dom</a> <a href="comput_1.html#K17">[+]</a>  <a href="tarski.html#R1">c=</a> <span class="p1">(<span class="default">1 <a href="nat_1.html#K1">+</a> 1</span>)</span> <a href="finseq_2.html#K4">-tuples_on</a> <a href="numbers.html#K5">NAT</a> 
 
<b>by </b><i><a class="ref" href="comput_1.html#T60">COMPUT_1:60</a>, <a class="ref" href="comput_1.html#D29">COMPUT_1:def 29</a></i>;<br/>
<b>hence </b><a NAME="E3:54"/>
 <a href="relat_1.html#K1">dom</a> <a href="comput_1.html#K17">[+]</a>  <a href="tarski.html#R1">c=</a> 2 <a href="finseq_2.html#K4">-tuples_on</a> <a href="numbers.html#K5">NAT</a> 
 ;<br/>


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