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6
votes
Parametrizing the realization space of a polyhedron by its edges
Alexander. http://www.springerlink.com/index/J4EXVR63M2QB95PP.pdf) …
18
votes
2
answers
5k
views
Nonvanishing of Jacobians implies global injectivity?
I am interested in obtaining injectivity of a $C^1$ map from the nonvanishing minors of its Jacobian matrix. Here is a brief history of the topic.
In 1953, Samuelson asked the following:
If the u …
2
votes
Accepted
Vapnik-Chervonenkis dimension of lines in the plane
If I understand the question correctly, a subset $l$ of lines belongs to $S$ if and only if there is a straight-line segment crossing exactly the lines from $l$.
The problem is then equivalent to the …
0
votes
Mappings of mapping class groups
You should have a look at the paper (now broken Springer link)
which deals with nonorientable surfaces with boundary.
Edit (April 17, 2023) I don't remember what paper I had in mind at that time. Sorr …
5
votes
Gröbner/SAGBI bases for non-commutative setting
There are lots of papers dealing with representation-theoretic questions and universal enveloping algebras using Gröbner bases. Some examples are given by these: 1, 2, 3, 4.
50
votes
Accepted
What, exactly, has Louis de Branges proved about the Riemann Hypothesis?
The paper by Conrey and Li "A note on some positivity conditions related to zeta and L-functions"
https://arxiv.org/abs/math/9812166
discusses some of the problems with de Branges's argument. They des …
5
votes
Are Pappus Theorems generalized?
Note: This is a generalization in a different direction from what the question asked for (these references generalize in terms of finding volumes, but Koundinya Vajjha wanted a generalization in terms …
2
votes
Accepted
Does it make sense that "Representations of groups over finite ring" ?
EDIT: Everything below the line is from before the OP changed his question. It was attempting to study linear maps $\rho: R \rightarrow GL(V)$ for $R$ a finite ring and $V$ a vector space. Now that th …
4
votes
Additive integer-valued functions on the module category
In general there are many such functions and the non-trivial ones are pretty interesting. I will focus on the commutative case, as that's what I know best.
So let $R$ be a commutative noetherian ring …
2
votes
Accepted
Is there a planar network whose path give a TNN matrix whose entries are Eulerian numbers?
There is a Bratelli diagram which satisfies this. Consider $\mathbb N^2$ as a graph where the edges are given by k parallel directed edges from $(n,k)$ to $(n+1,k)$, and $n-k+1$ parallel directed edge …
4
votes
Abundance for algebraic surfaces
This is more a remark than an answer.
It is perhaps worth noting that in the related classification of foliations on surfaces by McQuillan, Brunella, and Mendes abundance does not hold. The so called …
30
votes
2
answers
3k
views
The difference between a handle decomposition and a CW decomposition
Let $M$ be a compact finite-dimensional smooth manifold. I have a question about the relationship between the statements that a Morse function induces a handle decomposition for $M$, and that it induc …
4
votes
0
answers
197
views
Inequalities between numerical invariants of nonsingular projective Varieties in positive Ch...
It is well-known that Miyaoka and Yau-type inequalities do not hold in positive characteristic. In "a note on Bogomolov-Gieseker’s inequality in positive characteristic", however, we can find the foll …
8
votes
Status of the Hadamard Circulant conjecture
The paper by Craigen and Jedwab points out a very definite flaw in the main theorem by Hurley, Hurley & Hurley, providing a counterexample to that theorem. So the conjecture is still open.
The paper …
21
votes
2
answers
1k
views
Geometric interpretation of exceptional symmetric spaces
Elie Cartan has classified all compact symmetric spaces admitting a compact simple Lie group as their group of motion.There are 7 infinite series and 12 exceptional cases. The exceptional cases are …