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Finite or discrete collections of geometric objects. Packings, tilings, polyhedra, polytopes, intersection, arrangements, rigidity.

14 votes
2 answers
876 views

Sets of evenly distributed points in the Euclidean plane

Is there a set $P \subset \mathbb{R}^2$ of points in the Euclidean plane whose intersection with every convex subset of $\mathbb{R}^2$ of area $1$ is nonempty but finite? If the answer is yes, can $P …
Stefan Kohl's user avatar
  • 19.6k
14 votes
Accepted

Lattice n-gons with ordered side lengths 1,2,3,...,n

There are indeed other such polygons. -- For example there is one for $n = 11$, as follows (the origin is in the lower left corner): Also there is one for $n = 15$: Further there are $21$ such p …
Stefan Kohl's user avatar
  • 19.6k
4 votes
Accepted

Higher dimensional Rubik's cube group

The 4-dimensional, i.e. $3 \times 3 \times 3 \times 3$, equivalent of the Rubik's cube has 8 three-dimensional sides, each of which consists of $3^3 = 27$ three-dimensional colored "squares". Of these …
Stefan Kohl's user avatar
  • 19.6k