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

4 votes

Minimal area of non-planar lattice curves

For any $\mathbb Z_2$-valued function $f$ on the set of segments $[v,v+e_i]$ for $v\in \mathbb Z^3$ and $i=1,2,3$, and any $S$ that bounds $C$ $$ \sum_{P\in S}\sum_{edge\in P} f(edge) $$ is independe …
Lev Borisov's user avatar
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0 votes

Examples of toric threefolds

If you are willing to work with smooth stacks, rather than smooth toric varieties (or alternatively consider toric varieties with quotient singularities) then it is definitely possible. Combinatoria …
Lev Borisov's user avatar
  • 5,186
3 votes

Three questions concerning lattice points on sphere surfaces

It is not really my area, but the answer to part 2 is that you are looking for the smallest $N$ such that there are exactly $8n-4$ ways of writing it in the form $a^2+b^2$. If such $N$ is even but i …
Lev Borisov's user avatar
  • 5,186