机构:
Europa Univ Flensburg, Inst Math Naturwissenschaftliche & Tech Bldg, Abt Math & Ihre Didakt, Flensburg, GermanyEuropa Univ Flensburg, Inst Math Naturwissenschaftliche & Tech Bldg, Abt Math & Ihre Didakt, Flensburg, Germany
Carl, Merlin
[1
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机构:
[1] Europa Univ Flensburg, Inst Math Naturwissenschaftliche & Tech Bldg, Abt Math & Ihre Didakt, Flensburg, Germany
We study clockability for Ordinal Turing Machines (OTMs). In particular, we show that, in contrast to the situation for ITTMs, admissible ordinals can be OTM-clockable, that Sigma(2)-admissible ordinals are never OTM-clockable and that gaps in the OTM-clockable ordinals are always started by admissible limits of admissible ordinals. This partially answers two questions in [3].