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Questions related to formal languages, grammars, and automata theory
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Why isn't DIV necessarily in P? [duplicate]
In my formal languages class, we discussed DIV, defined as following:
$\mathrm{DIV} = \{\langle a,b\rangle : \text{$a, b \in N$ and $a$ has a divisor $d$ for some $1 < d \leq b$ }\}$
($\langle\cdot\ …