2,891 reputation
726
bio website
location
age
visits member for 5 years, 1 month
seen yesterday

Nov
18
comment Decomposing polyhedral cones into “direct sums” and a polynomial
Is the sum of the $d_i$ anything nice? (That would be the multiplicity of the root 1, of course.)
Nov
17
comment Pyramid and intersections
This site is for research level math questions. For questions like this, you will have more luck at math.stackexchange.com.
Nov
14
comment Regular unimodular triangulation for a certain simplex
I think the question as stated is a perfectly good question, so I would be in favour of not deleting it. I would also be interested in knowing what question you meant to ask, though I guess it should be a separate question. Also (though this may become clear when I know what question you were answering) it isn't clear to me why the triangulation you give in your answer is automatically regular.
Nov
14
comment Regular unimodular triangulation for a certain simplex
This doesn't seem right to me. What if the vertices are (0,0), (0,2), and (3,2)? The edge joining (0,0) to (3,2) is not an intersection of lines such as you describe.
Nov
13
answered Positivity of Ehrhart polynomial coefficients
Oct
16
awarded  Yearling
Oct
1
comment ellipsoids have spherical section
In case it wasn't clear from Ryan's comment, in the 3-d case, there is one condition which involves $x_1$ and $x_3$. One linear condition in $\mathbb R^3$ defines a plane. In this case, as Ryan pointed out, a plane containing the $x_2$-axis.
Sep
4
reviewed Approve suggested edit on Computing the q-series of the j-invariant
Sep
3
reviewed Approve suggested edit on Injective dimension of graded-injective modules
Aug
21
revised abstract-polytopes wiki description
fixed typo in what I wrote
Aug
21
suggested suggested edit on abstract-polytopes tag wiki
Aug
21
revised abstract-polytopes wiki excerpt
added 103 characters in body
Aug
21
revised abstract-polytopes wiki description
added 536 characters in body
Aug
21
wiki created abstract-polytopes description
Aug
21
wiki created abstract-polytopes excerpt
Aug
21
suggested suggested edit on abstract-polytopes tag wiki
Aug
21
suggested suggested edit on abstract-polytopes tag wiki excerpt
Aug
21
awarded  Excavator
Aug
21
comment Criteria for abstract polytopes to be convex polytope
This is called the "Steinitz problem". See mathematik.tu-darmstadt.de/~pfetsch/apropo/…
Aug
21
revised What's the best way to test if a sphere is a polytope? (algorithms for the Simplicial Steinitz Problem)
fix dead link