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Search options not deleted url *springerlink.com*
6 votes

Parametrizing the realization space of a polyhedron by its edges

Alexander. http://www.springerlink.com/index/J4EXVR63M2QB95PP.pdf) …
M. Winter's user avatar
  • 13.6k
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 …
The Amplitwist's user avatar
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 …
YCor's user avatar
  • 63.9k
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.
Robert Furber's user avatar
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 …
Martin Sleziak's user avatar
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 …
Glorfindel's user avatar
  • 2,821
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 …
The Amplitwist's user avatar
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 …
Glorfindel's user avatar
  • 2,821
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 …
Glorfindel's user avatar
  • 2,821
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 …
The Amplitwist's user avatar
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 …
Glorfindel's user avatar
  • 2,821
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 …

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