Abstract
In the setting of the parametrized reducibilities introduced by the second author and Mike Fellows, we prove a number of decidability and definability results. In particular the undecidability of the relevant m-degree structures is proven. The relationship with classical notions is analyzed, and this leads to a number of observations about classical constructions in the PTIME degrees. Methods include 0″, 0″′ and 0 (4) priority arguments combined with speedup type arguments.
Partially supported by a Victoria University Postdoctoral Fellowship, and by an N.S.F. Postdoctoral Fellowship.
Partially supported by the Victoria University IGC, the U.S.-New Zealand cooperative foundation grant INT 90-20558, Cornell University and the MSI at Cornell.
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© 1993 Springer Science+Business Media New York
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Cholak, P., Downey, R. (1993). Undecidability and Definability for Parametrized Polynomial Time m-Reducibilities. In: Crossley, J.N., Remmel, J.B., Shore, R.A., Sweedler, M.E. (eds) Logical Methods. Progress in Computer Science and Applied Logic, vol 12. Birkhäuser, Boston, MA. https://doi.org/10.1007/978-1-4612-0325-4_7
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DOI: https://doi.org/10.1007/978-1-4612-0325-4_7
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