Abstract
The paper surveys the main results obtained for Turing machines about the frontier between a decidable halting problem and universality. The notion of decidability criterion is introduced. Techniques for decidability proofs and for contracting universal objects are sketchily explained. A new approach for finding very small universal Turing machines is considered in the last part of the paper.
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Margenstern, M. (1997). Decidability and undecidability of the halting problem on Turing machines, a survey. In: Adian, S., Nerode, A. (eds) Logical Foundations of Computer Science. LFCS 1997. Lecture Notes in Computer Science, vol 1234. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-63045-7_23
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DOI: https://doi.org/10.1007/3-540-63045-7_23
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