Towards a theory of infinite time blum-shub-smale machines

  • Authors:
  • Peter Koepke;Benjamin Seyfferth

  • Affiliations:
  • Mathematisches Institut, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany;Mathematisches Institut, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany

  • Venue:
  • CiE'12 Proceedings of the 8th Turing Centenary conference on Computability in Europe: how the world computes
  • Year:
  • 2012

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Abstract

We introduce a generalization of Blum-Shub-Smale machines on the standard real numbers ℝ that is allowed to run for a transfinite ordinal number of steps before terminating. At limit times, register contents are set to the ordinary limit of previous register contents in ℝ. It is shown that each such machine halts before time ωω or diverges. We undertake first steps towards estimating the computational strength of these new machines.