no. 2
Complexity results for prefix grammars
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 39 (2005) no. 2, pp. 391-401.

Resolving an open problem of Ravikumar and Quan, we show that equivalence of prefix grammars is complete in PSPACE. We also show that membership for these grammars is complete in P (it was known that this problem is in P) and characterize the complexity of equivalence and inclusion for monotonic grammars. For grammars with several premises we show that membership is complete in EXPTIME and hard for PSPACE for monotonic grammars.

DOI : 10.1051/ita:2005024
Classification : 03D03, 68Q17, 68Q42, 68Q45
Mots clés : rewriting systems, regular languages, computational complexity 
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Lohrey, Markus; Petersen, Holger. Complexity results for prefix grammars. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 39 (2005) no. 2, pp. 391-401. doi : 10.1051/ita:2005024. http://archive.numdam.org/articles/10.1051/ita:2005024/

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