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- W1996878052 abstract "There is a context-free language $L_0 $ such that every context-free language is an inverse homomorphic image of $L_0 $ or $L_0 - { e} $. Hence the time complexity of recognition of $L_0 $ is the least upper bound for time complexity of recognition of context-free languages. A similar result holds for quasirealtime Turing machine languages. Several languages are given such that deterministic and nondeterministic polynomial time acceptance are equivalent if and only if any one of them is deterministic polynomial time acceptable." @default.
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- W1996878052 date "1973-12-01" @default.
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- W1996878052 title "The Hardest Context-Free Language" @default.
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- W1996878052 doi "https://doi.org/10.1137/0202025" @default.
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