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1–9 (1973) This paper contains some important PSPACE-completeness results

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3.2 PSPACE and strategies for game playing 4. N L-completeness

4.1 Certificate definition ofN L: Read-once certificates 4.2 N L = coN L

See

Sanjeev Arora, Boaz Barak:

Computational Complexity — A Modern Approach,

p. 83–88, Cambridge University Press: Cambridge-New York-Melbourne, 2009

CT 4.2N L= coN L 25/40

c

Ernst W. Mayr

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Further references:

Larry J. Stockmeyer, Albert R. Meyer:

Word problems requiring exponential time,

Proceedings of the 5th Symposium on Theory of Computing, p. 1–9 (1973) This paper contains some important PSPACE-completeness results.

Albert R. Meyer, Larry J. Stockmeyer:

The equivalence problem for regular expressions with squaring requires exponential space,

Proceedings of the 13th Annual Symposium on Switching and Automata Theory, p. 125–129 (1972)

This paper contains an EXPSPACE-completeness result.

And here anN L-machine based proof forN L =coN L:

Holenstein, Thomas Complexity Theory,

p. 13–14, Script, ETH Z¨urich, 2010

CT 4.2N L= coN L 26/40

c

Ernst W. Mayr

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