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In computability and complexity, finding mappings between problems that allow solving one problem using a solution of another one. For reduction in programming language theory (e.g. beta-reduction), see [lambda-calculus] or [term-rewriting].

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DFA accepts common strings, reduction to NPcomplete

$B=\{\left<M_1,M_2,...,M_k\right>\text{ : Each $M_i$ is a DFA and all of the $M_i$ accept some common string.} \}$ I'm trying to show that B is NP-complete. I know I have to reduce it to another NP-c …
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