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Oct 2, 2021 at 3:03 history made wiki Post Made Community Wiki by Asaf Karagila
Oct 2, 2021 at 2:46 comment added Yoav Kallus Of course, closely related is NP-completeness and undecidability of packing and tiling with non-square shapes and no matching rules. See e.g. mathoverflow.net/questions/344559/…
Oct 1, 2021 at 23:59 history answered Yoav Kallus CC BY-SA 4.0