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Questions related to formal languages, grammars, and automata theory

3 votes
1 answer
117 views

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\ …
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