Equivalence Problems for Tree Transducers: A Brief Survey

Sebastian Maneth
(University of Edinburgh)

The decidability of equivalence for three important classes of tree transducers is discussed. Each class can be obtained as a natural restriction of deterministic macro tree transducers (MTTs): (1) no context parameters, i.e., top-down tree transducers, (2) linear size increase, i.e., MSO definable tree transducers, and (3) monadic input and output ranked alphabets. For the full class of MTTs, decidability of equivalence remains a long-standing open problem.

Invited Presentation in Zoltán Ésik and Zoltán Fülöp: Proceedings 14th International Conference on Automata and Formal Languages (AFL 2014), Szeged, Hungary, May 27-29, 2014, Electronic Proceedings in Theoretical Computer Science 151, pp. 74–93.
Published: 21st May 2014.

ArXived at: http://dx.doi.org/10.4204/EPTCS.151.5 bibtex PDF
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