Abstract
Two schema problems from the 1970s are examined, monadic recursion schemes and first-order recursion schemas. Research on these problems halted because they were shown to be equivalent to the problem of decidability of language equivalence between DPDA (deterministic pushdown automata). Recently a decidability proof for equivalence of DPDA was given by Sénizergues [10, 11], which therefore also solves the schema problems. However Sénizergues proof is quite formidable. A simplification of the proof was presented by the author [13] using ideas from concurrency theory (for showing decidability of bismilarity [9, 12]) and crucial insights from Sénizergues’s intricate proof.
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© 2000 Springer-Verlag Berlin Heidelberg
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Stirling, C. (2000). Schema Revisited. In: Clote, P.G., Schwichtenberg, H. (eds) Computer Science Logic. CSL 2000. Lecture Notes in Computer Science, vol 1862. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44622-2_7
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DOI: https://doi.org/10.1007/3-540-44622-2_7
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