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For questions about mathematical tiling.
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Which unfoldings of the hypercube tile 3-space: How to check for isometric space-fillers?
Here is an example of one of the two one that fit in a 4x4x2 box ( in an exploded view, you can shift them together and they neatly fit into a 4x4x2 box, which can then be stacked to obtain a tiling.: … Here's a two-dimensional example:
The tile:
A 5x6 box filled with copies of that tile:
A tiling produced from this:
This can be formulated a as an integer program and it turns out that those 261 unfoldings …