Alok Aggarwal, Ashok K. Chandra, et al.
Theoretical Computer Science
Paper
Inherently nonplanar automata
Abstract
It is shown that for every finite-state automaton there exists an equivalent nondeterministic automaton with a planar state graph. However there exist finite-state automata with no equivalent deterministic automaton with a planar state graph. © 1976 Springer-Verlag.
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Computable nondeterministic functions
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FOCS 1978