Self-assembly of decidable sets

  • Authors:
  • Matthew J. Patitz;Scott M. Summers

  • Affiliations:
  • Department of Computer Science, University of Texas---Pan American, Edinburg, USA 78539;Department of Computer Science and Software Engineering, University of Wisconsin---Platteville, Platteville, USA 53818

  • Venue:
  • Natural Computing: an international journal
  • Year:
  • 2011

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Abstract

The theme of this paper is computation in Winfree's Abstract Tile Assembly Model (TAM). We first review a simple, well-known tile assembly system (the "wedge construction") that is capable of universal computation. We then extend the wedge construction to prove the following result: if a set of natural numbers is decidable, then it and its complement's canonical two-dimensional representation self-assemble. This leads to a novel characterization of decidable sets of natural numbers in terms of self-assembly. Finally, we show that our characterization is robust with respect to various (restrictive) geometrical constraints.