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2 votes
1 answer
158 views

On sets of rectangles that can all together form at least one big rectangle

Let us say a set of $n$ rectangles is rectifiable if all $n$ rectangles together form a big rectangle without gaps or overlaps. Question: How hard computationally is the question of deciding whether a ...
Nandakumar R's user avatar
  • 5,979
19 votes
1 answer
616 views

How hard is it to tell when a finite set tiles the integers?

Given a nonempty set $B$ of integers between 1 and $n$, we wish to determine whether or not $\mathbb{Z}$ can be tiled with translates of $B$ (that is, covered by disjoint translates of $B$). I know an ...
James Propp's user avatar
  • 19.7k
7 votes
1 answer
186 views

Decidability of convex rearrangements of polygons

Triggered by the MO question, "How many convex shapes can be made with the pieces of the Stomachion?," I would like to pose this question: Q. Given $n$ polygons in a set $S$, say each with integer ...
Joseph O'Rourke's user avatar
1 vote
0 answers
43 views

Reference requests for tiling easiness [closed]

For Wang tile problem, is there some general statements in a paper stating that the more tiles (supposed provided by random) available, the easier it is for these tiles to tile the plane? Thank you.
user40780's user avatar
  • 867
5 votes
0 answers
145 views

Complexity of $\mathbb{Z}^n$ tilings

Let $\mathcal{T} \subset \mathbb{Z}^n$ be a finite set. Let $\Lambda \subset \mathbb{Z}^n$ be a full rank lattice. We say that $\mathcal{T}$ is a $\Lambda$-tile for $\mathbb{Z}^n$ if the following ...
Campello's user avatar
  • 800
4 votes
1 answer
549 views

Tiling with restricted overlap

Non-overlapping tilings of regions is a well-studied topic. I wonder if the following variant has been considered: A tile can be partitioned into several regions, where such regions from different ...
Per Alexandersson's user avatar
20 votes
2 answers
2k views

"a shape that ... lies halfway between a square and a circle"

An article in the Notices of the AMS, Volume 61, Issue 10, 2014 (PDF download link), on Khot's Unique Games Conjecture, says this: Another group ... found a shape that in a certain sense lies ...
Joseph O'Rourke's user avatar
5 votes
1 answer
213 views

Aperiodic set of corner Wang Tile [closed]

There is quite some reference on aperiodicity of the edge-type of Wang Tile. But I could not yet find aperiodic corner type of Wang Tiles... Could someone provide me some instances (better with ...
user40780's user avatar
  • 867