Abstract Geometrical Computation and the Linear Blum, Shub and Smale Model

  • Authors:
  • Jérôme Durand-Lose

  • Affiliations:
  • Laboratoire d'Informatique Fondamentale d'Orléans, Université d'Orléans, B.P. 6759, F-45067 ORLÉANS Cedex 2,

  • Venue:
  • CiE '07 Proceedings of the 3rd conference on Computability in Europe: Computation and Logic in the Real World
  • Year:
  • 2007

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Abstract

Abstract geometrical computation naturally arises as acontinuous counterpart of cellular automata. It relies on signals(dimensionless points) traveling at constant speed in a continuousspace in continuous time. When signals collide, they are replacedby new signals according to some collision rules. This simpledynamics relies on real numbers with exact precision and is alreadyknown to be able to carry out any (discrete) Turing-computation.The Blum, Shub and Small (BSS) model is famous for computing overℝ (considered here as a ℝ unlimited register machine)by performing algebraic computations.We prove that signal machines (set of signals and correspondingrules) and the infinite-dimension linear (multiplications are onlyby constants) BSS machines can simulate one another.