Time and Space Complexity of Inside-Out Macro Grammars


Asveld, Peter R.J. (1980) Time and Space Complexity of Inside-Out Macro Grammars. [Report]

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Abstract:Starting form Fischer's IO Standard Form Theorem we show that for each inside-out (or IO-) macro language $L$ there exists a $\lambda$-free IO macro grammar with the following property: for each $x$ in $L$ there is a derivation of $x$ of length at most linear in the length of $x$. Then we construct a nondeterministic log-space bounded auxiliary pushdown automaton which accepts $L$ in polynomial time. Therefore the IO-macro languages are (many-one) log-space reducible to the context-free languages. Consequently, the membership problem for IO-macro languages can be solved deterministically in polynomial time and in space $(\log n)^2$.
Item Type:Report
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/66021
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