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Findings in the Area of Information Technology Reported from University of Oxford (Language equivalence of probabilistic pushdown automata)

August 26, 2014



By a News Reporter-Staff News Editor at Information Technology Newsweekly -- New research on Information Technology is the subject of a report. According to news originating from Oxford, United Kingdom, by VerticalNews correspondents, research stated, "We study the language equivalence problem for probabilistic pushdown automata (pPDA) and their subclasses."

Our news journalists obtained a quote from the research from the University of Oxford, "We show that the problem is interreducible with the multiplicity equivalence problem for context-free grammars, the decidability of which has been open for several decades. Interreducibility also holds for pPDA with one control state."

According to the news editors, the research concluded: "In contrast, for the case of a one-letter input alphabet we show that pPDA language equivalence (and hence multiplicity equivalence of context-free grammars) is in PSPACE and at least as hard as the polynomial identity testing problem."

For more information on this research see: Language equivalence of probabilistic pushdown automata. Information and Computation, 2014;237():1-11. Information and Computation can be contacted at: Academic Press Inc Elsevier Science, 525 B St, Ste 1900, San Diego, CA 92101-4495, USA. (Elsevier - www.elsevier.com; Information and Computation - www.elsevier.com/wps/product/cws_home/622844)

The news correspondents report that additional information may be obtained from V. Forejt, University of Oxford, Dept. of Comp Sci, Oxford, United Kingdom. Additional authors for this research include P. Jancar, S. Kiefer and J. Worrell.

Keywords for this news article include: Oxford, Europe, United Kingdom, Information Technology

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Source: Information Technology Newsweekly


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