Paper by Martin L. Demaine

Sarah Cannon, Erik D. Demaine, Martin L. Demaine, Sarah Eisenstat, Matthew J. Patitz, Robert Schweller, Scott M. Summers, and Andrew Winslow, “Two Hands Are Better Than One (up to constant factors): Self-Assembly In The 2HAM vs. aTAM”, in Proceedings of the 30th International Symposium on Theoretical Aspects of Computer Science (STACS 2013), Kiel, Germany, February 27–March 2, 2013, pages 172–184.

We study the difference between the standard seeded model (aTAM) of tile self-assembly, and the “seedless” two-handed model of tile self-assembly (2HAM). Most of our results suggest that the two-handed model is more powerful. In particular, we show how to simulate any seeded system with a two-handed system that is essentially just a constant factor larger. We exhibit finite shapes with a busy-beaver separation in the number of distinct tiles required by seeded versus two-handed, and exhibit an infinite shape that can be constructed two-handed but not seeded. Finally, we show that verifying whether a given system uniquely assembles a desired supertile is co-NP-complete in the two-handed model, while it was known to be polynomially solvable in the seeded model.

The full paper is available as of the Computing Research Repository (CoRR).

Copyright held by the authors. Licensed under the Creative Commons Attribution-No Derivative Works 3.0 license.

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