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Paper detail

Fixed Parameter Undecidability for Wang Tilesets

Deciding if a given set of Wang tiles admits a tiling of the plane is decidable if the number of Wang tiles (or the number of colors) is bounded, for a trivial reason, as there are only finitely many such tilesets. We prove however that the tiling problem remains undecidable if the difference between the number of tiles and the number of colors is bounded by 43. One of the main new tool is the concept of Wang bars, which are equivalently inflated Wang tiles or thin polyominoes.

preprint2012arXivOpen access
Emmanuel JeandelNicolas Rolin
Formal Languages and Automata TheoryComputational Complexity
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Emmanuel JeandelNicolas Rolin

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