Randomness and reducibility

  • Authors:
  • Rod G. Downey;Denis R. Hirschfeldt;Geoff LaForte

  • Affiliations:
  • School of Mathematical and Computing Sciences, Victoria University of Wellington, New Zealand;Department of Mathematics, The University of Chicago, 57345 S. University Ave., Chicago, IL;Department of Computer Science, University of West Florida, FL

  • Venue:
  • Journal of Computer and System Sciences
  • Year:
  • 2004

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Abstract

We study reducibilities that act as measures of relative randomness on reals, concentrating particularly on their behavior on the computably enumerable reals. One such reducibility, called domination or Solovay reducibility, has already proved to be a powerful tool in the study of randomness of effectively presented reals. Motivated by certain shortcomings of Solovay reducibility, we introduce two new measures of relative randomness and investigate their properties and the relationships between them and Solovay reducibility.