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arxiv: 0805.4049 · v3 · submitted 2008-05-27 · 💻 cs.DM · cs.CC

An NP-hardness Result on the Monoid Frobenius Problem

classification 💻 cs.DM cs.CC
keywords problemco-finitedecideexpressionfollowingfrobeniusgivenmonoid
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The following problem is NP-hard: given a regular expression $E$, decide if $E^*$ is not co-finite.

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