Abstract
Goldschlager first established that a special case of the monotone planar circuit problem can be solved by a Turing machine in $O(\log^{2} n)$ space. Subsequently, Dymond and Cook refined the argument and proved that the same class can be evaluated in $O(\log^{2} n)$ time with a polynomial number of processors. In this paper, we prove that the general monotone planar circuit value problem can be evaluated in $O(\log^{4} n)$ time with a polynomial number of processors, settling an open problem posed by Goldschlager and Parberry.
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